Skip to main content Accessibility help


  • Access
  • Open access


      • Send article to Kindle

        To send this article to your Kindle, first ensure is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

        Note you can select to send to either the or variations. ‘’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

        Find out more about the Kindle Personal Document Service.

        Energy restriction in renal protection
        Available formats

        Send article to Dropbox

        To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

        Energy restriction in renal protection
        Available formats

        Send article to Google Drive

        To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

        Energy restriction in renal protection
        Available formats
Export citation


Energy restriction (ER) has been widely studied as a novel intervention, and its ability to prolong life has been fully demonstrated. For example, ER can significantly extend the lifespans of model flies, worms, rodents and other mammals. The role of ER in renal protection has also been elucidated. In preclinical studies, adjusting total energy intake or consumption of specific nutrients has prophylactic or therapeutic effects on ageing-related kidney disease and acute and chronic kidney injury. Amino acid restriction has gradually attracted attention. ER mimetics have also been studied in depth. The protective mechanisms of ER and ER mimetics for renal injury include increasing AMP-activated protein kinase and sirtuin type 1 (Sirt1) levels and autophagy and reducing mammalian target of rapamycin, inflammation and oxidative stress. However, the renal protective effect of ER has mostly been investigated in rodent models, and the role of ER in patients cannot be determined due to the lack of large randomised controlled trials. To protect the kidney, the mechanism of ER must be thoroughly researched, and more accurate diet or drug interventions need to be identified.

In 1935, McCay et al.( 1 ) discovered for the first time that energy restriction (ER) was able to extend the mean and maximal lifespans of rodents. Recently, in a 20-year study of primates, Colman found that ER beneficially aided resistance to age-related diseases and death( 2 ). ER can ameliorate the effects of senescence and age-related diseases without causing malnutrition in many animal models, including invertebrates, rodents and primates. At the same time, reducing intake of specific nutrients rather than overall energy content can also play a key role in these observed effects. Restricting protein and specific amino acids largely contributes to the effects of ER. In addition, the use of energy restriction mimetics (ERM) has gradually gained attention.

Acute kidney injury (AKI) is a common disorder with a high risk of mortality and development of chronic kidney disease (CKD). In 2013, the International Society of Nephrology launched a global target of ‘0by25’ – no patient deaths due to untreated acute kidney failure by 2025 – to improve the diagnosis and treatment of AKI globally( 3 ). A systematic review (2004–2012) of large cohort studies published in 2013 on the worldwide AKI prevalence reported that one in five adults and one in three children experienced AKI during a hospital episode of care( 4 ). Moreover, a recent large, prospective, multinational study of AKI epidemiology in children and young adults in intensive care units showed that AKI occurred in one-quarter of patients during the first 7 d after intensive care unit admission( 5 ). These analyses have raised awareness of AKI among the public, government officials and health care professionals. If effective treatment is not provided promptly, AKI will eventually lead to death or CKD. Age is also an important risk factor for kidney injury. Therefore, finding a way to delay ageing of the kidney and to protect the kidney may have great significance for reducing the occurrence of kidney injury.

Nadon’s study found that ER can prevent or delay the occurrence of age-related nephropathy( 6 ). ER also reduces mesangial cell proliferation, stromal hyperplasia and proteinuria and prevent age-related glomerulosclerosis in aged rats( 7 ). The same preventive or protective effects against acute and chronic kidney injury are achieved by adjusting total dietary energy content or the ingestion of specific nutritional components. For example, protein restriction (PR) in the diet can improve symptoms of uraemia. In addition, a low-protein diet (plus essential amino acids or keto acids) can improve metabolic disorders in CKD and rectify metabolic acidosis, Ca and P metabolism and other abnormalities, thereby delaying the time of renal replacement therapy; this diet is therefore an important intervention for the treatment of CKD. However, the protective effect and mechanism of ER in renal injury have not been fully elucidated. In this review, we summarise the current knowledge in this regard.

In some studies, dietary restriction (DR) is equivalent to ER, indicating an overall decrease in food consumption. Most DR studies impose a 20–40 % ER, and the duration of this restriction ranges from a few weeks to an entire lifespan( 8 ). After the beneficial effects of ER on the body were confirmed by a large number of studies, questions arose concerning whether the reduced intake of certain nutrients, such as proteins, lipids or carbohydrates, induced by ER played a synergistic role in the body. Although some studies have found that restricting carbohydrates, lipids, minerals and other nutrients does not significantly extend lifespan, inhibit tumour development or impose other effects( 9 , 10 ), most PR studies have reported longevity benefits. These findings highlighted the specific importance of PR, even though the effect of PR was less than that of ER( 11 ). Next, researchers began to explore whether the restriction of a particular amino acid was responsible for the main benefit of PR( 12 ).

Basic study and mechanisms

To observe the effects of ER on the lifespan and kidney disease, studies have focused on basic research with animal models. The identified mechanisms include increased autophagy, reduced inflammation and oxidative stress, improved insulin sensitivity and increased sirtuin type 1 (Sirt1) levels (Fig. 1). The amount (20–40 %) and duration (intermittent or continuous fasting ranging from weeks to the entire lifespan) of ER also vary.

Fig. 1 The mechanisms of energy restriction in renal protection. The main identified mechanisms include increased AMP-activated protein kinase (AMPK), sirtuin type 1 (Sirt1) and autophagy and reduced mammalian target of rapamycin (mTOR), inflammation and oxidative stress. SAA, sulphur amino acid; BCAA, branched-chain amino acid.

Ageing-related renal changes

In ER studies, effects on ageing and ageing-related alterations are the primary observational indicators, and these parameters have been used in various animal models, including humans, mice, flies and worms. Currently, most studies on kidney senescence use rodent or primate models. Many studies have shown that ER can delay the ageing-induced incidence of CKD, improve kidney function and delay the incidence of kidney disease. The AMP-activated protein kinase (AMPK) and mammalian target of rapamycin (mTOR) pathways are important for cellular energy metabolism. Increased mTOR expression in the ageing kidneys of rats indicates that mTOR activation can accelerate senescence of the kidney( 13 ), whereas AMPK phosphorylation can inhibit this process. Mammalian target of rapamycin complex 1 (mTORC1) inhibition in aged rats can regulate age-related gene changes in the kidney and block age-related chronic progressive nephropathy( 14 ). Our previous study also found that stimulation with high glucose induced senescence in rat mesangial cells through AMPK/mTOR pathways( 15 ). Our later study showed that short-term ER directly up-regulated AMPK and down-regulated the mTOR signalling pathway, which significantly down-regulated urinary proteins in older rats and delayed tubular epithelial cell senescence and the epithelial to mesenchymal transition (EMT) stimulated by high glucose( 16 ). MicroRNA-21 (miR-21) targets the regulation of PPARα, which can promote the EMT in human renal tubular epithelial cells through hypoxia-inducible factor (HIF)-1α ( 17 ). In rats, long-term ER significantly improves ageing and fibrosis of the kidneys and reduces miR-21 expression in ageing renal tissue or urinary exosomes. A meta-analysis of ER studies revealed that ER delayed the progression of CKD, reduced serum creatinine, urea N and proteinuria levels and improved the survival rate in rodent models by reducing the incidence of diseases, such as CKD( 8 ).

Lopez-Dominguez et al. studied the effect of fat composition on longevity. The mice were divided into a control group and three 40 % ER groups. The fat sources of the three ER groups were soyabean oil (high in n-6 PUFA), fish oil (high in n-3 PUFA) or lard (high in SFA and MUFA). This study found that the animals fed lard had increased longevity compared with the mice fed soyabean or fish oil( 18 ). This finding suggests that the use of a low proportion of PUFA and a high proportion of MUFA and SFA can maximise the lifespan under ER conditions. Using a ER model, Calvo-Rubio et al. studied the contribution of fat sources to changes in the kidney structure. Long-term ER improved the structure of senescent kidneys, as evidenced by the enlargement of the glomerular basal membrane (GBM) and podocyte foot processes (PFP), narrowing of the filtration slits and modification of proximal convoluted tubule cells. In addition, the beneficial effects of ER on GBM thickness, PFP width, autophagy and the mitochondrial mass, size and shape were based on lard as the main fat source( 19 ). This result clarifies the critical role of fat sources in delaying kidney ageing.


During ageing, inflammation and proinflammatory factors gradually increase, which is called the senescence-associated secretory phenotype (SASP). In addition, chronic inflammation is considered a potential risk factor for senescence( 20 , 21 ). Inhibiting inflammation may be an important strategy to slow ageing. In mice, chronic inflammation induced by selective knockout of the NF-κB subunit leads to premature ageing via reactive oxygen species (ROS)-mediated exacerbation of telomere dysfunction and cell senescence( 22 ). Some studies have revealed that SASP reinforces senescence via increasing ROS in a mechanism similar to interferon-β and transforming growth factor-β (TGF-β)( 23 , 24 ). End-stage renal disease (ESRD) patients have an abnormal immune system. Uraemic inflammation is related to mechanisms involved in the ageing process, such as telomere shortening, mitochondrial dysfunction and altered nutrient sensing. These mechanisms may promote a premature ageing process of the uraemic immune system( 25 ).

In animals, ER can reduce the level of inflammatory cytokines and mitigate inflammation. The NF-κB transcription and proinflammatory cytokine levels increase with age( 26 ). During the renal senescence process, IL-1β and IL-18 promote apoptosis in mesangial cells and podocytes, facilitate extracellular matrix deposition and eventually lead to glomerulosclerosis( 27 ). A 6-week ER can reduce TNF-α expression in the rat liver( 28 ). Short-term (4 weeks) ER also reduces expression of a variety of inflammatory factors, improves insulin sensitivity and ultimately relieves renal ischaemia–reperfusion injury. These effects contribute to an increased survival rate( 29 ). Pathological studies have also shown that ER can reduce a variety of glomerular and tubular injuries, including proliferation in ageing kidneys, leukocyte infiltration, vascular endothelial thickening, thrombosis, interstitial inflammatory cell infiltration and epithelial cell degeneration, atrophy and interstitial fibrosis. ER blocks the Toll-like receptor 4 (TLR4)/NF-κB signalling pathway by overexpressing the single Ig IL-1-related molecule (SIGIRR), thereby reducing the expression of downstream inflammatory cytokines and slowing inflammation of the kidney( 30 ). SIGIRR negatively regulates the TLR4 signalling pathway, inhibits lipopolysaccharide-induced activation of TLR4 and NF-κB and down-regulates expression of leukocyte adhesion molecules, cytokines and angiogenic factors( 31 ). SIGIRR is an important negative regulator of inflammation( 32 ) that can inhibit renal fibrosis( 33 ). The specific mechanism of ER and inflammation in the ageing kidney has yet to be fully elucidated; therefore, SIGIRR may be an important component in the ER-induced anti-inflammatory anti-ageing process and may serve as a new target for slowing ageing.

Oxidative stress

ROS and other active molecules are produced in excess when the body continues to encounter stress factors. The oxidative and antioxidative systems become unbalanced. This imbalance can be further aggravated if the body presents with additional defects in the antioxidant capacity, eventually leading to injury( 34 , 35 ). Therefore, to delay kidney ageing and prevent and treat ageing-related kidney disease, the level of oxidative stress in the body must be reduced, and the redox balance should be maintained.

d-β-Hydroxybutyrate (βOHB) is an endogenous specific inhibitor of class I histone deacetylases. In addition to administration of exogenous βOHB, fasting and ER can increase the production of endogenous βOHB, resulting in histone acetylation in mouse tissues and transcription of antioxidant stress factors, such as Forkhead box O3 (Foxo3a) and metallothionein-2( 36 ). The most recent literature shows that ER suppresses mitochondrial oxidative stress by up-regulating H2S production, which protects the liver and kidneys from ischaemia–reperfusion injury. Further in vivo and in vitro experiments have shown that restricting the intake of sulphur amino acids (SAA), such as cysteine and methionine, can also mitigate ischaemia–reperfusion injury in the liver and kidney via endogenous H2S levels( 37 ). SAA restriction reduces mitochondrial oxidative stress in the brain, heart, liver and kidneys( 38 40 ). Our previous studies discovered that the production of endogenous H2S was up-regulated after exposure of ageing male F344 rats to 30 % ER, which resulted in decreased ROS levels, protein carbonylation and malondialdehyde production; in addition, the redox balance was maintained, and kidney ageing was delayed. Furthermore, different durations of ER had different protective effects against oxidative stress in ageing kidneys. Compared with short-term (6 weeks) ER, ER lasting 6 months or the entire lifespan significantly prolonged the lifespan and reduced oxidative stress( 41 ).

Sirtuin type 1 and autophagy

Initially, Sirt1 was identified as a NAD-dependent histone deacetylase( 42 ). Subsequent studies have shown that under fasting conditions, Sirt1 regulates energy metabolism and the stress response via acetylation of many internal nuclear transcription factors( 43 ). In addition, some studies have demonstrated an effect of ER and Sirt1 on kidney injury and glomerular diseases in ageing models. Research on the protective mechanism of Sirt1 in the kidney under ER conditions is gradually expanding.

Sirt1 is mainly expressed in renal tubules. In mice, Sirt1 activity gradually decreases with age in the kidney and in a mouse model of diabetic nephropathy (DN), but this effect can be reversed by ER( 44 ). Compared with the levels in younger animals, 24-month-old mice presented with decreased Sirt1 expression, increased mitochondrial oxidative stress and abnormal mitochondrial morphology in the kidney. Beginning a 40 % ER intervention at 12 months of age can relieve the ageing-associated changes observed in mice( 45 ). Long-term ER improves autophagic activity, which also occurs in ageing kidneys. Autophagy provides nutrients and energy by degrading unessential contents within the autophagosome. This process can also prevent cell damage and cell apoptosis by degrading potential toxic proteins( 46 ). Autophagy activation has been found to be essential for ER-mediated life extension and anti-ageing effects in both lower animal species and mammals. Short-term ER activates autophagy in renal tubular epithelial cells( 45 ). In addition, long-term ER in ageing rats significantly improves autophagy and reduces DNA damage and ageing markers( 47 ). Sirt1-mediated autophagy may be critical for the mechanisms of ER. BCL2/adenovirus E1B 19 kDa protein-interacting protein 3 (Bnip3) is a gene that activates autophagy. In Sirt1+/− kidneys, autophagic activity is low, and Bnip3 expression is decreased; however, ER activates Sirt1 and FOXO3a transcription and Bnip3-mediated autophagy. The sequestosome 1 (p62/Sqstm1) pathway is involved in autophagy; ER increases p62/Sqstm1 signalling, improves the function of the autophagy system and normalises mitochondrial morphology in addition to rescuing Sirt1 expression( 44 ).

In a kidney disease model, Sirt1 activation attenuates cisplatin-induced renal tubular injury. The molecular mechanisms involve inactivating core histone transcription and repairing DNA damage( 48 ). An 8-week ER increases Sirt1 expression in the kidneys of aged rats, inhibits renal tubular epithelial cell apoptosis and reduces cisplatin-induced AKI( 49 ). Microinflammation has recently been implicated in the pathogenesis of or treatment for DN. Sirt1 also has anti-inflammatory effects in many organs( 50 ), suggesting that Sirt1 is involved in ER-related anti-inflammatory molecular mechanisms. Moreover, Sirt1 up-regulates cyclo-oxygenase-2 expression in the kidney by interfering with HIF-2α activation, increases peroxidase activity and inhibits the expression of TGF-β-Smad3 (mothers against decapentaplegic homolog 3), NF-κB, p53 and other pathways to prevent inflammation, apoptosis, fibrosis and proliferation in the kidney( 51 ).

Protein restriction

A large number of studies have proven the protective effect of ER, but it remains unclear whether a specific nutrient in the diet mediates the main effect of ER. After comparing multiple nutrients, PR has emerged as potentially important for ER( 11 ).

Studies have shown that PR can achieve effects similar to those of ER. FOXO3, hepatocyte nuclear factor 4 and high mobility group A1 expression in the kidneys of 3-month-old male C57 mice was increased by 30 % ER and 3-d PR, thereby reducing ischaemia–reperfusion injury in the kidney( 52 ). In Dahl SS rats, a high-protein diet exacerbates the deterioration in blood pressure that accompanies extensive glomerular inflammatory cell infiltration( 53 ). PR also has an effect on the mTOR pathway that is similar to that of ER. In male mice, PR and ER both contribute to the benefits of short-term ER against renal ischaemic–reperfusion injury in a manner that is partially dependent on AMPK activation and mTORC1 repression( 54 ). As a nutrient-associated pathway, AMPK/mTOR plays a key role in the protective effect in the kidney during PR or ER( 54 ), and mTOR has been shown to be a central regulator of cell growth. mTOR activation plays a pivotal role in DN and the development of ESRD( 55 ). Thus, inhibition of mTOR may be a strong potential therapeutic target for acute and chronic kidney injury.

Regarding specific amino acids, methionine restriction achieves effects similar to those of PR, such as reducing mitochondrial ROS production, free radical leakage and the mitochondrial DNA 8-oxo-2′-deoxyguanosine levels( 11 ). Chronic or excessive methionine supplementation also increases renal tubulointerstitial damage( 56 ). In the rat liver and kidney, methionine supplementation increases the two methionine-derived circulating metabolites (S-adenosylmethionine (SAM) and S-adenosine homocysteine (SAH)) and induces some damage, such as the generation of mitochondrial free radicals and oxidative DNA damage. Mitochondrial and DNA damage are related to overproduction of SAM and SAH( 57 ). A 40 % methionine restriction reduces mitochondrial ROS production, free radical release, renal mitochondrial DNA oxidative damage and mitochondrial protein oxidation-specific markers (i.e. lipoxidation and glycoxidation). This methionine restriction also reduces the expression levels of mitochondrial respiratory chain complexes I, III and IV, apoptosis-inducing factor and renal mitochondrial complex IV in the brain( 58 , 59 ). In 2015, Hine et al. found that ER increased production of endogenous H2S in the liver and kidney through increased synthase cystathionine-γ-lyase (CGL) and cystathionine-β-synthase expression, which reduced ischaemia–reperfusion injury by restoring the redox balance. Methionine and cysteine supplementation abrogated H2S production and the significant benefits of combined protein/energy restriction( 37 ). This finding provides a new mechanism for the protective effect of methionine restriction. Although toxic at high levels, H2S is produced at low concentrations due to cysteine or homocysteine degradation by CGL and has a beneficial effect on the vasculature and brain. H2S acts as a signalling molecule to reduce blood pressure( 60 ) and prevent neurodegeneration( 61 ). Exogenous H2S can also extend the lifespan of worms( 62 ) and induce suspended animation-like states in mammals( 63 ). The increase in H2S production induced by SAA restriction can activate the proangiogenic pathway through general control non-derepressible 2/activating transcription factor 4 (GCN2-/ATF4) in endothelial cells, which increases capillary density in mouse skeletal muscle( 64 ). In addition, an interaction occurs between H2S and Sirt1 during regulation of angiogenesis in old mice to reverse age-associated loss in muscle vascular density. H2S has been hypothesised to delay ageing in part by activating Sirt1, which is a major lifespan regulator( 65 ). As the only source of endogenous H2S, methionine restriction may have a good application prospect for renal protection.

Leucine restriction (LR) for 7 d resulted in body weight loss and decreased adiposity( 66 ). A specific reduction in the consumption of three branched-chain amino acids (BCAA; leucine, isoleucine and valine) by mice can improve metabolic health( 67 ). LR can replicate some, but not all of the effects of methionine restriction, such as decreasing body and fat mass, elevating lipid cycling in white adipose tissue and improving whole-body glucose metabolism and hepatic insulin sensitivity( 68 ). However, changes in the kidney after LR have not been investigated. Insulin resistance affects many aspects of kidney function, including renal haemodynamics, podocyte viability and tubular function( 69 ). Thus, BCAA restriction may be a promising treatment for DN in addition to LR.

In CKD, PR can reduce proteinuria and decrease urea N levels and changes in the kidney; however, excessive PR decreases the serum albumin level and slows growth. Adding keto acids can correct these results and have better effects than single PR( 70 ). Kruppel-like factor 15 (KLF15) is a transcription factor that is reduced in heart fibrosis. KLF15 was also decreased in a CKD model. PR increases the KLF15 level in healthy kidneys and partially recovers the KLF15 level in kidneys with residual renal function( 71 ). This finding demonstrates the potential role of PR in anti-renal fibrosis.

Energy restriction mimetics


ERM are drugs that increase the consumption of food and water without adjusting energy intake and are believed to achieve the same effects as ER, such as prolonging the lifespan and reducing age-related diseases( 72 ). Metformin is a representative ERM drug.

Derivatives of biguanide compounds, such as buformin, metformin and phenformin, improve the stability of blood glucose and demonstrate preventive effects on ageing. These drugs can also induce metabolic effects by activating AMPK and inhibiting mTOR( 73 ). Metformin slows ageing and extends the lifespan of female spontaneously hypertensive rat mice( 74 ). In addition, metformin impedes the TGF-β-induced loss of the epithelial marker E-cadherin in MCF-7 breast cancer cells and prevents the accumulation of the mesenchymal marker vimentin in Madin–Darby canine kidney (MDCK) cells( 75 ). In Zucker diabetic fatty rats, metformin decreases oxygen consumption and the ATP levels, increases the intracellular oxygen partial pressure and reduces HIF-1 expression, pimonidazole staining and renal damage( 76 ). In our experiments, metformin inhibited the expression of HIF-1α and its target genes in human renal proximal tubular epithelial cells( 16 ). Studies on the renal-protective effects of metformin have mainly been conducted with diabetic patients. A recent systematic review showed that metformin reduced the all-cause death rate in diabetic patients with CKD (glomerular filtration rate (GFR) <60 ml/min per 1·73 m2)( 77 ). However, the application of this result in patients with DN is limited, since they are at risk for lactic acidosis. Because the clinical application of metformin is still mainly focused on the treatment of diabetes mellitus, the effects of metformin on other diseases, such as cancer and lifespan, remain controversial. The US National Institute on Aging Interventions Testing Program( 78 ) evaluated the influence of different agents on longevity in genetically heterogeneous mice. When used alone, metformin showed a non-significant effect on the median lifespan, and the site-specific effects were indistinguishable from chance, which was different from some past reports. This discrepancy was likely due to the use of genetically heterogeneous mice, the initiation time of metformin treatment, evaluation of male and female mice, analysis at three independent sites and the choice of statistical method. Interestingly, metformin combined with rapamycin robustly extended the lifespan, which was an added benefit, compared to rapamycin alone, indicating that metformin might have some positive effects on the lifespan. However, large-scale clinical trials are needed to evaluate the effects on longevity and renal disease patients.


Rapamycin is an Food and Drug Administration-approved drug that is used to coat coronary stents and prevent organ transplant rejection, such as kidney and islets( 79 ). Rapamycin specifically inhibits mTOR and leads to very significant inhibition of renal cyst growth as a ERM for renal protection. Autophagy is regulated by mTORC1 and other nutrient-responsive intracellular signals; rapamycin, which improves glomerular lesions in experimental DN, can activate autophagy( 80 ). Autosomal-dominant polycystic kidney disease (ADPKD) is a common cause of ESRD. The mTOR pathway has been shown to be activated in ADPKD, and inhibition of mTOR with rapamycin decreases the development of ADPKD in mice( 81 , 82 ). In diabetic obese db/db mice, which are characterised by mTOR activation, systemic administration of rapamycin markedly ameliorates pathological changes and renal dysfunctions( 55 ). Inhibition of the mTOR pathway with rapamycin and activation of the AMPK pathway with metformin also lead to decreased cystogenesis in MDCK cell and metanephric cultures( 83 ). Due to its outstanding effect on mTOR inhibition, rapamycin may have a good application prospect for kidney disease, especially DN and ADPKD.


Resveratrol, which is a monomer of polyphenol found in grapes, can also simulate the biological effects produced by ER, such as reducing oxidative stress in renal injury. Recent studies by Kitada have shown that resveratrol can inhibit Smad3 acetylation by activating Sirt1 in unilateral ureteral obstruction (UUO) animal models or cultured cells, leading to a decrease in TGF-β1-induced type IV collagen and fibronectin. This effect can alleviate renal injury during hypoxic stress( 84 ). Resveratrol can also improve the activity and function of antioxidants by activating Sirt1 during acute and chronic kidney injury( 85 ). For AKI models, resveratrol can be used from 10 to 100 mg/kg and the protective effects can be produced within 3–5 d of injection( 86 88 ). This shows that resveratrol can have the effect on renal protection in a short time. However, the long-term effect of resveratrol on the renal repair function after AKI is relatively limited, and can be one of the research directions in the future. The beneficial effects of ER involve impacts on the function of Sirt1. Sirt1 is a key molecule that regulates renal protective effects in various renal disorder models. The protective effects include maintenance of glomerular barrier function, anti-fibrotic effects, anti-oxidative stress effects and regulation of mitochondrial function and energy metabolism( 89 ). Resveratrol is the most potent Sirt1 activator. Sirt1 is highly expressed in the kidney, especially in proximal tubular cells. Moreover, renal proximal tubular cells are susceptible to injury, and senescence may occur first in tubular cells. These facts all make resveratrol a superior ERM for the kidney. In diabetic mouse models, Sirt1 expression is significantly reduced in the proximal tubules of wild-type mice( 89 ). Previous studies have clearly demonstrated that resveratrol can improve DN in several animal models of type 1 and 2 diabetes. Resveratrol prevents DN in db/db mice by phosphorylation of AMPK and activation of Sirt1 to prevent mesangial cell apoptosis and oxidative stress in the kidney( 90 ). Therefore, resveratrol may have a protective effect on both AKI and CKD.

The effect of resveratrol may be mediated through a Sirt1-independent mechanism. The mTOR signalling pathway is associated with DN and polycystic kidney disease( 91 , 92 ). Resveratrol increases the interaction between mTOR and its inhibitor DEP (dishevelled, egl-10, pleckstrin) domain-containing mTOR-interacting protein, resulting in mTOR inhibition( 93 ). Therefore, resveratrol may also achieve its renal protective effect through mTOR. Our study also found that resveratrol mitigated high glucose-induced human proximal tubular cell senescence in vitro and prevented the formation of paracrine vesicles containing miR-21, which promoted the EMT process( 16 ).

Clinical studies

Energy content and proteins

Clinical studies on ER have focused on metabolism and insulin sensitivity as well as oxidative stress, inflammation, cardiovascular risk factors and corresponding indicators of patients with obesity or diabetes. Clinical studies on the renal-protective effects are more concentrated on PR in CKD patients and on ER in DN patients.

Clinical studies on ER are limited, and thus the role of ER in CKD patients cannot be determined due to the lack of large randomised controlled trials (RCT). Giordani et al.( 94 ) analysed the glomerular filtration rate (GFR) of fourteen obese patients with type 2 diabetes and stage 2 CKD; the study concluded that 7 d of a low-energy diet significantly improved the GFR of these patients. Therefore, short-term ER may improve renal function. In addition, ER for 12 weeks decreased body weight and the serum creatinine and cystatin C levels in obese patients with DN and increased the GFR( 95 ). In 2003, Morales et al.( 96 ) studied the weights and proteinuria of CKD patients. A total of thirty overweight or obese patients with albuminuria, including DN patients and patients with other manifestations of proteinuria, were randomly divided into two groups. The patients were given either a normal diet or a low-energy diet. After 5 months, the urine protein was decreased by 30 % in the ER group (from an average of 2·8–1·9 g/d). The renal function remained stable in the ER group but had a worsening trend in the free diet group; however, the renal function was not significantly different between the two groups.

Ageing progresses so slowly that clinical dietary interventions on ageing take a very long time and may be difficult to apply in people due to inconvenience issues. In addition, ER may still cause some negative effects, such as a decline in the quality of life, and people may not adhere to long-term ER. Although ER has proven to be beneficial for longevity in animal models ranging from worms to primates, long-term ER is difficult to achieve in people. For people, ERM may be more practical than ER( 97 ).

The PR program for kidney disease may have been performed for the first time in patients by Kempner( 98 ). Kempner thought that the kidney played a key role in malignant hypertension. He began to treat patients with malignant hypertension with a diet composed of nothing but rice and fruit. Most patients were able to reduce their blood pressure. However, he also found that the treatment of kidney disease and hypertensive with the rice diet was either ineffective or dangerous unless it was conducted under rigidly controlled conditions( 99 ). Therefore, the time and level of PR are essential for the regimen for renal disease patients. PR reduces uraemic toxins, blood urea N levels, the acid load, oxidative stress and the phosphate load and also improves insulin resistance and control over metabolic bone disease and ameliorates anaemia( 100 103 ). Depending on the protein source, PR may delay progression of CKD mainly by reducing the Na, K and P levels. Adding keto acids to PR during CKD stages 4–5 or before or during dialysis aids in the avoidance of malnutrition and improves the patient prognosis. Although this method improves endothelial function, no obvious reduction in cardiovascular risk has been found( 70 ). PR did not significantly decrease blood P levels, and a vegetarian diet only reduced blood P by 3 mg/l. The modification of diet in renal disease study also showed that the risk of death for patients with advanced CKD receiving a very low-protein diet of 0·58 g/kg body weight per d was higher than that for patients receiving a low-protein diet of 0·6–0·8 g/kg per d. The clinical research results related to PR are inconsistent. Some studies indicate that changes in protein intake will not cause significant changes in renal function, disease progression or the risk of dialysis and death( 104 106 ). However, most studies show that PR delays the decline in renal function and improves the renal survival rate. Although the results vary, they still support dietary intervention for patients with early CKD and DN.


Urinary albumin excretion is an important independent risk factor for the development and progression of kidney disease as well as for CVD, such as diabetes and hypertension. A number of RCT studies have shown that limiting salt intake significantly reduces urinary albumin and the albumin:creatinine ratio (9·1 mg/24 h and 0·66 mg/mmol, respectively) and improves arterial compliance in different ethnic patients with mild hypertension( 107 ). In CKD patients with proteinuria, salt restriction reduces the vascular endothelial growth factor C and N terminal pro B type natriuretic peptide levels, impairs increases in the extracellular volume and decreases hypertension( 108 ). In patients with high blood pressure, urine protein can be reduced from 93 (SD 48) to 75 (SD 30) mg/24 h( 109 ). However, endpoint events were not observed. In 2015, McMahon et al.( 110 ) conducted a systematic analysis of eight previous studies and found a lack of evidence supporting the long-term effects of low salt intake in CKD patients and the direct impact of this modification on end points such as mortality and ESRD. A decrease in blood pressure and proteinuria was identified, which was beneficial for reducing the incidence of ESRD and cardiovascular events in CKD patients.


Hyperphosphataemia accelerates renal failure. Moreover, accelerated ageing is associated with high serum inorganic phosphate (Pi) levels. The Psychological, Social and Biological Determinants of Ill Health pSoBid cohort study performed by the University of Glasgow explored the impact of dietary P intake on human age-related health. The data indicate that high Pi levels are associated with features of biological ageing, such as decreasing telomere lengths and increases in inflammation and DNA hypomethylation. For renal health, Pi levels have a close relationship with renal function based on estimated glomerular filtration rate (eGFR) measurement. Some subjects with high Pi levels have eGFR values indicative of incipient or early onset CKD( 111 ). Pi overload may lead to tubular injury and interstitial fibrosis( 112 ). Serum phosphate and its product, calcium phosphate, were increased significantly in uraemic rats fed high P for 6 months, resulting in a mortality rate of 71·4 %. In rats fed a low-P diet, the parathyroid hormone and fibroblast growth factor-23 (FGF-23) levels were significantly decreased in the blood, and the mortality rate was only 5·9 %. In addition to reducing vascular calcification, a low-P diet can relieve renal interstitial fibrosis, glomerular sclerosis and inflammatory cell infiltration( 113 ). High levels of hyperphosphataemia are associated with CVD events in CKD and ESRD populations as well as in healthy people. In dialysis patients, high P and death are positively correlated. FGF-23 is the most important P-regulating hormone and increases P excretion when the serum phosphate level is too high, but FGF-23 also decreases the vitamin D levels, promotes ventricular hypertrophy, accelerates the deterioration of renal function and increases cardiovascular mortality.

Dietary P includes both organic and inorganic P. Organic P comes from protein sources, whereas inorganic P originates from additives or preservatives. Although the body absorbs approximately 90 % of inorganic P, the absorption of organic P is only 40–60 %( 114 ). In an effort to limit P, PR may increase the incidence of mortality and malnutrition in CKD and dialysis patients. The Kidney Disease Outcomes Quality Initiative recommends a P intake of 800–1000 mg/d for CKD patients( 115 ). Selamet et al.( 116 ) found that phosphates in food were not associated with the incidence of ESRD or CVD or with non-CVD or all-cause mortality in patients with stage 3–5 CKD; in addition, serum P levels and health benefits were not related to P restriction. The National Health and Nutrition Examination Survey III showed that the serum P concentration increased by only 0·06 mg/l per 500 mg/d intake( 117 ). JAMA published a study in which haemodialysis patients were educated about the products that contained high inorganic P (i.e. soda water), and the intake of these products was limited. This approach significantly reduced the serum P level by 10 mg/l( 118 ). Therefore, to avoid the adverse events caused by low protein intake, reasonable P restrictions should mainly focus on inorganic P. In addition, P binders can be used to emulate P restriction in patients with advanced CKD( 114 ).


ER protects the kidney in different ways, and ERM are gradually being studied in more depth. Most of the studies in this review focus on rodent model. There are considerable differences between rodents and humans with respect to genetics, anatomy, physiology and metabolism, as well as the structure of the kidney. For example, there is a multilobular, multipapillary architecture in the kidneys of humans and mini pigs, whereas mice, rats, dogs and rabbits have unilobular, unipapillary kidneys( 119 ). Therefore, the rodent model results cannot be completely equivalent to human research. However, the protective effect of ER on kidney has been studied in humans, and some similar results can be reached. Therefore, most of the studies about rodent model are also useful for clinical research. As most studies on ER have employed basic research, translating the results to clinical practice is difficult. Clinical trials require volunteer enrolment, and the results are closely associated with the subjects’ compliance. Achieving the desired clinical results with mandatory ER may be difficult. In addition, the best ER application, such as the optimal duration and starting time, ER personalisation programs for unique groups of people and patients, the choice of either a general ER or restriction of a specific nutrient, the ethical issues involved and the overall impact on the patient’s situation, must be discussed. The lack of prospective clinical trials and the suitability of ERM for clinical use are worthwhile issues for continued discussion. In the future, we hope to propose a more accurate diet or drug intervention program through in-depth studies on the mechanism of DR.


This work was supported by the National Key R&D Program of China (2018YFA0108803), the 973 Program (2013CB530800), the Twelfth Five-Year National Key Technology Research and Development Program (2015BAI12B06 and 2013BAI09B05), the 863 Program (2012AA02A512) and the NSFC (81401160 and 81070267).

W.-S. Y. contributed to the literature search and analysis of the published data. W.-S. Y., C.-G. Y. and C.-X. M. contributed to the manuscript writing and revisions of the article. All authors approved the final manuscript.

The authors declare no conflicts of interest arising from the conclusions of this work.


1. McCay, CM, Crowell, MF & Maynard, LA (1989) The effect of retarded growth upon the length of life span and upon the ultimate body size. 1935. Nutrition 5, 6379.
2. Colman, RJ, Anderson, RM, Johnson, SC, et al. (2009) Caloric restriction delays disease onset and mortality in rhesus monkeys. Science 325, 201204.
3. Remuzzi, G & Horton, R (2013) Acute renal failure: an unacceptable death sentence globally. Lancet 382, 20412042.
4. Susantitaphong, P, Cruz, DN, Cerda, J, et al. (2013) World incidence of AKI: a meta-analysis. Clin J Am Soc Nephrol 8, 14821493.
5. Kaddourah, A, Basu, RK, Bagshaw, SM, et al. (2016) Epidemiology of acute kidney injury in critically ill children and young adults. N Engl J Med 376, 1120.
6. Kirk, KL (1993) Dietary restriction and aging. J Am Geriatr Soc 41, 994999.
7. Wiggins, J & Bitzer, M (2013) Slowing the aging process. Clin Geriatr Med 29, 721730.
8. Xu, XM, Cai, GY, Bu, R, et al. (2015) Beneficial effects of caloric restriction on chronic kidney disease in rodent models: a meta-analysis and systematic review. PLOS ONE 10, e0144442.
9. Khorakova, M, Deil, Z, Khausman, D, et al. (1990) Effect of carbohydrate-enriched diet and subsequent food restriction on life prolongation in Fischer 344 male rats. Fiziol Zh 36, 1621.
10. Shimokawa, I, Higami, Y, Yu, BP, et al. (1996) Influence of dietary components on occurrence of and mortality due to neoplasms in male F344 rats. Aging 8, 254262.
11. Sanchez-Roman, I & Barja, G (2013) Regulation of longevity and oxidative stress by nutritional interventions: role of methionine restriction. Exp Gerontol 48, 10301042.
12. Grandison, RC, Piper, MD & Partridge, L (2009) Amino-acid imbalance explains extension of lifespan by dietary restriction in Drosophila . Nature 462, 10611064.
13. Zhuo, L, Cai, G, Liu, F, et al. (2009) Expression and mechanism of mammalian target of rapamycin in age-related renal cell senescence and organ aging. Mech Age Dev 130, 700708.
14. Shavlakadze, T, Zhu, J, Wang, S, et al. (2018) Short-term low-dose mTORC1 inhibition in aged rats counter-regulates age-related gene changes and blocks age-related kidney pathology. J Gerontol A Biol Sci Med Sci 73, 845852.
15. Guo, YN, Wang, JC, Cai, GY, et al. (2014) AMPK-mediated downregulation of connexin43 and premature senescence of mesangial cells under high-glucose conditions. Exp Gerontol 51, 7181.
16. Dong, D, Cai, GY, Ning, YC, et al. (2017) Alleviation of senescence and epithelial-mesenchymal transition in aging kidney by short-term caloric restriction and caloric restriction mimetics via modulation of AMPK/mTOR signaling. Oncotarget 8, 1610916121.
17. Chau, BN, Xin, C, Hartner, J, et al. (2012) MicroRNA-21 promotes fibrosis of the kidney by silencing metabolic pathways. Sci Transl Med 4, 121ra118.
18. Lopez-Dominguez, JA, Ramsey, JJ, Tran, D, et al. (2015) The influence of dietary fat source on life span in calorie restricted mice. J Gerontol A Biol Sci Med Sci 70, 11811188.
19. Calvo-Rubio, M, Buron, MI, Lopez-Lluch, G, et al. (2016) Dietary fat composition influences glomerular and proximal convoluted tubule cell structure and autophagic processes in kidneys from calorie-restricted mice. Aging Cell 15, 477487.
20. Kim, HJ, Jung, KJ, Ji, SY, et al. (2006) The inflammatory process in aging. Antioxid Redox Signal 8, 572581.
21. Salminen, A, Huuskonen, J, Ojala, J, et al. (2008) Activation of innate immunity system during aging: NF-κB signaling is the molecular culprit of inflamm-aging. Ageing Res Rev 7, 83105.
22. Jurk, D, Wilson, C, Passos, JF, et al. (2014) Chronic inflammation induces telomere dysfunction and accelerates ageing in mice. Nat Commun 2, 4172.
23. Moiseeva, O, Mallette, FA, Mukhopadhyay, UK, et al. (2006) DNA damage signaling and p53-dependent senescence after prolonged β-interferon stimulation. Mol Biol Cell 17, 15831592.
24. Tremain, R, Marko, M, Kinnimulki, V, et al. (2000) Defects in TGF-beta signaling overcome senescence of mouse keratinocytes expressing v-Ha-ras. Oncogene 19, 16981709.
25. Kooman, J, Dekker, M, Usvyat, LA, et al. (2017) Inflammation and premature aging in advanced chronic kidney disease. Am J Physiol Renal Physiol 313, F938F950.
26. Csiszar, A, Gautam, T, Sosnowska, D, et al. (2014) Caloric restriction confers persistent anti-oxidative, pro-angiogenic, and anti-inflammatory effects and promotes anti-aging miRNA expression profile in cerebromicrovascular endothelial cells of aged rats. Am J Physiol Heart Circ Physiol 307, H292H306.
27. Bolignano, D, Mattaceraso, F, Sijbrands, EJ, et al. (2014) The aging kidney revisited: a systematic review. Ageing Res Rev 14, 6580.
28. Mohammadi, M, Ghaznavi, R, Keyhanmanesh, R, et al. (2014) Caloric restriction prevents lead-induced oxidative stress and inflammation in rat liver. ScientificWorldJournal 2014, 821524.
29. Mitchell, JR, Verweij, M, Brand, K, et al. (2010) Short-term dietary restriction and fasting precondition against ischemia reperfusion injury in mice. Aging Cell 9, 4053.
30. Xu, XM, Ning, YC, Wang, WJ, et al. (2015) Anti-inflamm-aging effects of long-term caloric restriction via overexpression of sigirr to inhibit NF-κB signaling pathway. Cell Physiol Biochem 37, 12571270.
31. Qin, J, Qian, Y, Yao, J, et al. (2005) SIGIRR inhibits interleukin-1 receptor- and Toll-like receptor 4-mediated signaling through different mechanisms. J Biol Chem 280, 2523325241.
32. Leemans, JC, Butter, LM, Teske, GJ, et al. (2012) The Toll interleukin-1 receptor (IL-1R) 8/single Ig domain IL-1R-related molecule modulates the renal response to bacterial infection. Infect Immun 80, 38123820.
33. Skuginna, V, Lech, M, Allam, R, et al. (2011) Toll-like receptor signaling and SIGIRR in renal fibrosis upon unilateral ureteral obstruction. PLoS ONE 6, e19204.
34. Harman, D (1981) The aging process. Proc Natl Acad Sci U S A 78, 71247128.
35. Liu, J, Wang, X, Shigenaga, MK, et al. (1996) Immobilization stress causes oxidative damage to lipid, protein, and DNA in the brain of rats. FASEB J 10, 15321538.
36. Shimazu, T, Hirschey, MD, Newman, J, et al. (2013) Suppression of oxidative stress by beta-hydroxybutyrate, an endogenous histone deacetylase inhibitor. Science 339, 211214.
37. Hine, C, Harputlugil, E, Zhang, Y, et al. (2015) Endogenous hydrogen sulfide production is essential for dietary restriction benefits. Cell 160, 132144.
38. Pamplona, R & Barja, G (2006) Mitochondrial oxidative stress, aging and caloric restriction: the protein and methionine connection. Biochim Biophys Acta 1757, 496508.
39. Sanchez-Roman, I & Barja, G (2013) Regulation of longevity and oxidative stress by nutritional interventions: role of methionine restriction. Exp Gerontol 48, 10301042.
40. Sanchez-Roman, I, Gómez, A, Pérez, I, et al. (2012) Effects of aging and methionine restriction applied at old age on ROS generation and oxidative damage in rat liver mitochondria. Biogerontology 13, 399411.
41. Wang, WJ, Cai, GY, Ning, YC, et al. (2016) Hydrogen sulfide mediates the protection of dietary restriction against renal senescence in aged F344 rats. Sci Rep 6, 30292.
42. Li, J, Qu, X, Ricardo, SD, et al. (2010) Resveratrol inhibits renal fibrosis in the obstructed kidney: potential role in deacetylation of smad3. Am J Pathol 177, 10651071.
43. Liang, F, Kume, S & Koya, D (2009) SIRT1 and insulin resistance. Nat Rev Endocrinol 5, 367373.
44. Kitada, M, Takeda, A, Nagai, T, et al. (2011) Dietary restriction ameliorates diabetic nephropathy through anti-inflammatory effects and regulation of the autophagy via restoration of Sirt1 in diabetic Wistar fatty (fa/fa) rats: a model of type 2 diabetes. Exp Diabetes Res 2011, 908185.
45. Kume, S, Uzu, T, Horiike, K, et al. (2010) Calorie restriction enhances cell adaptation to hypoxia through Sirt1-dependent mitochondrial autophagy in mouse aged kidney. J Clin Invest 120, 10431055.
46. Kume, S, Yamahara, K, Yasuda, M, et al. (2014) Autophagy: emerging therapeutic target for diabetic nephropathy. Semin Nephrol 34, 916.
47. Cui, J, Shi, S, Sun, X, et al. (2013) Mitochondrial autophagy involving renal injury and aging is modulated by caloric intake in aged rat kidneys. PLOS ONE 8, e69720.
48. Sakao, Y, Kato, A, Tsuji, T, et al. (2011) Cisplatin induces Sirt1 in association with histone deacetylation and increased Werner syndrome protein in the kidney. Clin Exp Nephrol 15, 363372.
49. Ning, YC, Cai, GY, Zhuo, L, et al. (2013) Beneficial effects of short-term calorie restriction against cisplatin-induced acute renal injury in aged rats. Nephron Exp Nephrol 124, 1927.
50. Yoshizaki, T, Schenk, S, Imamura, T, et al. (2010) SIRT1 inhibits inflammatory pathways in macrophages and modulates insulin sensitivity. Am J Physiol Endocrinol Metab 298, E419E428.
51. Kume, S, Kitada, M, Kanasaki, K, et al. (2013) Anti-aging molecule, Sirt1: a novel therapeutic target for diabetic nephropathy. Arch Pharm Res 36, 230236.
52. Jongbloed, F, Saat, TC, Verweij, M, et al. (2017) A signature of renal stress resistance induced by short-term dietary restriction, fasting, and protein restriction. Sci Rep 7, 40901.
53. De Miguel, C, Lund, H & Mattson, DL (2011) High dietary protein exacerbates hypertension and renal damage in Dahl SS rats by increasing infiltrating immune cells in the kidney. Hypertension 57, 269274.
54. Robertson, LT, Treviñovillarreal, JH, Mejia, P, et al. (2015) Protein and calorie restriction contribute additively to protection from renal ischemia reperfusion injury partly via leptin reduction in male mice. J Nutr 145, 17171727.
55. Mori, H, Inoki, K, Masutani, K, et al. (2009) The mTOR pathway is highly activated in diabetic nephropathy and rapamycin has a strong therapeutic potential. Biochem Biophys Res Commun 384, 471475.
56. Kumagai, H, Katoh, S, Hirosawa, K, et al. (2002) Renal tubulointerstitial injury in weanling rats with hyperhomocysteinemia. Kidney Int 62, 12191228.
57. Gomez, J, Caro, P, Sanchez, I, et al. (2009) Effect of methionine dietary supplementation on mitochondrial oxygen radical generation and oxidative DNA damage in rat liver and heart. J Bioenerg Biomembr 41, 309321.
58. Caro, P, Gomez, J, Sanchez, I, et al. (2009) Forty percent methionine restriction decreases mitochondrial oxygen radical production and leak at complex I during forward electron flow and lowers oxidative damage to proteins and mitochondrial DNA in rat kidney and brain mitochondria. Rejuvenation Res 12, 421434.
59. Naudí, A, Jové, M, Ayala, V, et al. (2011) Regulation of membrane unsaturation as antioxidant adaptive mechanism in long-lived animal species. Free Radic Antioxid 1, 312.
60. Yang, G (2009) H2S as a physiologic vasorelaxant: hypertension in mice with deletion of cystathionine gamma-lyase. Science 322, 587590.
61. Paul, BD & Snyder, SH (2012) H2S signalling through protein sulfhydration and beyond. Nat Rev Mol Cell Biol 13, 499507.
62. Miller, DL & Roth, MB (2007) Hydrogen sulfide increases thermotolerance and lifespan in Caenorhabditis elegans . Proc Natl Acad Sci U S A 104, 2061820622.
63. Blackstone, E, Morrison, M & Roth, MB (2005) H2S induces a suspended animation-like state in mice. Science 308, 518.
64. Longchamp, A, Mirabella, T, Arduini, A, et al. (2018) Amino acid restriction triggers angiogenesis via GCN2/ATF4 regulation of VEGF and H2S production. Cell 173, 117129.
65. Shang, Z, Chao, L, Chen, S, et al. (2012) Effect of H2S on the circadian rhythm of mouse hepatocytes. Lipids Health Dis 11, 23.
66. Ying, C, Meng, Q, Wang, C, et al. (2010) Leucine deprivation decreases fat mass by stimulation of lipolysis in white adipose tissue and upregulation of uncoupling protein 1 (UCP1) in brown adipose tissue. Diabetes 59, 1725.
67. Fontana, L, Cummings, N, Arriolaapelo, S, et al. (2016) Decreased consumption of branched-chain amino acids improves metabolic health. Cell Rep 16, 520530.
68. Lees, EK, Banks, R, Cook, C, et al. (2017) Direct comparison of methionine restriction with leucine restriction on the metabolic health of C57BL/6J mice. Sci Rep 7, 9977.
69. Artunc, F, Schleicher, E, Weigert, C, et al. (2016) The impact of insulin resistance on the kidney and vasculature. Nat Rev Nephrol 12, 721737.
70. Aparicio, M, Bellizzi, V, Chauveau, P, et al. (2012) Protein-restricted diets plus keto/amino acids – a valid therapeutic approach for chronic kidney disease patients. J Ren Nutr 22, S1S21.
71. Gao, X, Huang, L, Grosjean, F, et al. (2011) Low-protein diet supplemented with ketoacids reduces the severity of renal disease in 5/6 nephrectomized rats: a role for KLF15. Kidney Int 79, 987996.
72. Ingram, DK, Zhu, M, Mamczarz, J, et al. (2006) Calorie restriction mimetics: an emerging research field. Aging Cell 5, 97108.
73. Dowling, RJ, Zakikhani, M, Fantus, IG, et al. (2007) Metformin inhibits mammalian target of rapamycin-dependent translation initiation in breast cancer cells. Cancer Res 67, 1080410812.
74. Anisimov, VN, Berstein, LM, Egormin, PA, et al. (2008) Metformin slows down aging and extends life span of female SHR mice. Cell Cycle 7, 27692773.
75. Cufi, S, Vazquez-Martin, A, Oliveras-Ferraros, C, et al. (2010) Metformin against TGFβ-induced epithelial-to-mesenchymal transition (EMT): from cancer stem cells to aging-associated fibrosis. Cell Cycle 9, 44614468.
76. Takiyama, Y, Harumi, T, Watanabe, J, et al. (2011) Tubular injury in a rat model of type 2 diabetes is prevented by metformin: a possible role of HIF-1α expression and oxygen metabolism. Diabetes 60, 981992.
77. Crowley, MJ, Diamantidis, CJ, Mcduffie, JR, et al. (2017) Clinical outcomes of metformin use in populations with chronic kidney disease, congestive heart failure, or chronic liver disease: a systematic review. Ann Intern Med 166, 191200.
78. Strong, R, Miller, RA, Antebi, A, et al. (2016) Longer lifespan in male mice treated with a weakly estrogenic agonist, an antioxidant, an α‐glucosidase inhibitor or a Nrf2‐inducer. Aging Cell 15, 872884.
79. Tsang, CK, Qi, H, Liu, LF, et al. (2007) Targeting mammalian target of rapamycin (mTOR) for health and diseases. Drug Discov Today 12, 112124.
80. Shinji, K & Daisuke, K (2015) Autophagy: a novel therapeutic target for diabetic nephropathy. Diabetes Metab J 39, 451460.
81. Shillingford, JM, Murcia, NS, Larson, CH, et al. (2006) From the cover: the mTOR pathway is regulated by polycystin-1, and its inhibition reverses renal cystogenesis in polycystic kidney disease. Proc Natl Acad Sci U S A 103, 54665471.
82. Kipp, KR, Rezaei, M, Lin, L, et al. (2016) A mild reduction of food intake slows disease progression in an orthologous mouse model of polycystic kidney disease. Am J Physiol Renal Physiol 310, F726F731.
83. Warner, G, Hein, KZ, Nin, V, et al. (2015) Food restriction ameliorates the development of polycystic kidney disease. J Am Soc Nephrol 27, 14371447.
84. Kitada, M, Kume, S, Takeda-Watanabe, A, et al. (2013) Sirtuins and renal diseases: relationship with aging and diabetic nephropathy. Clin Sci (Lond) 124, 153164.
85. Kitada, M & Koya, D (2013) Renal protective effects of resveratrol. Oxid Med Cellular Longev 2013, 568093.
86. Do Amaral, CL, Francescato, HD, Coimbra, TM, et al. (2008) Resveratrol attenuates cisplatin-induced nephrotoxicity in rats. Arch Toxicol 82, 363370.
87. Hong, YA, Bae, SY, Ahn, SY, et al. (2017) Resveratrol ameliorates contrast induced nephropathy through the activation of SIRT1-PGC-1α-Foxo1 signaling in mice. Kidney Blood Press Res 42, 641653.
88. Holthoff, JH, Wang, Z, Seely, KA, et al. (2012) Resveratrol improves renal microcirculation, protects the tubular epithelium, and prolongs survival in a mouse model of sepsis-induced acute kidney injury. Kidney Int 81, 370378.
89. Shu, W, Hasegawa, K & Itoh, H (2015) Sirtuin and metabolic kidney disease. Kidney Int 88, 691698.
90. Kim, MY, Lim, JH, Youn, HH, et al. (2013) Resveratrol prevents renal lipotoxicity and inhibits mesangial cell glucotoxicity in a manner dependent on the AMPK-SIRT1-PGC1α axis in db/db mice. Diabetologia 56, 204217.
91. Godel, M, Hartleben, B, Herbach, N, et al. (2011) Role of mTOR in podocyte function and diabetic nephropathy in humans and mice. J Clin Invest 121, 21972209.
92. Inoki, K, Mori, H, Wang, J, et al. (2011) mTORC1 activation in podocytes is a critical step in the development of diabetic nephropathy in mice. J Clin Invest 121, 21812196.
93. Liu, M, Wilk, SA, Wang, A, et al. (2010) Resveratrol inhibits mTOR signaling by promoting the interaction between mTOR and DEPTOR. J Biol Chem 285, 3638736394.
94. Giordani, I, Malandrucco, I, Donno, S, et al. (2014) Acute caloric restriction improves glomerular filtration rate in patients with morbid obesity and type 2 diabetes. Diabetes Metab 40, 158160.
95. Friedman, AN, Chambers, M, Kamendulis, LM, et al. (2013) Short-term changes after a weight reduction intervention in advanced diabetic nephropathy. Clin J Am Soc Nephrol 8, 18921898.
96. Morales, E, Valero, MA, Leon, M, et al. (2003) Beneficial effects of weight loss in overweight patients with chronic proteinuric nephropathies. Am J Kidney Dis 41, 319327.
97. Stenvinkel, P, Kooman, JP & Shiels, PG (2016) Nutrients and ageing: what can we learn about ageing interactions from animal biology? Curr Opin Clin Nutr Metab Care 19, 1925.
98. Kempner, W (1946) Some effects of the rice diet treatment of kidney disease and hypertension. Bull N Y Acad Med 22, 358370.
99. Kempner, W (1949) Treatment of heart and kidney disease and of hypertensive and arteriosclerotic vascular disease with the rice diet. Ann Intern Med 31, 821856.
100. Bellizzi, V, Iorio, BRD, Nicola, LD, et al. (2007) Very low protein diet supplemented with ketoanalogs improves blood pressure control in chronic kidney disease. Kidney Int 71, 245251.
101. Di Iorio, BR, Minutolo, R, De Nicola, L, et al. (2003) Supplemented very low protein diet ameliorates responsiveness to erythropoietin in chronic renal failure. Kidney Int 64, 18221828.
102. Rigalleau, V, Blanchetier, V, Combe, C, et al. (1997) A low-protein diet improves insulin sensitivity of endogenous glucose production in predialytic uremic patients. Am J Clin Nutr 65, 15121516.
103. Combe, C, Morel, D, Précigout, VD, et al. (1995) Long-term control of hyperparathyroidism in advanced renal failure by low-phosphorus low-protein diet supplemented with calcium (without changes in plasma calcitriol). Nephron 70, 287295.
104. Williams, PS, Stevens, ME, Fass, G, et al. (1991) Failure of dietary protein and phosphate restriction to retard the rate of progression of chronic renal failure: a prospective, randomized, controlled trial. Pediatr Nephrol 81, 837855.
105. Malvy, D, Maingourd, C, Pengloan, J, et al. (1999) Effects of severe protein restriction with ketoanalogues in advanced renal failure. J Am Coll Nutr 18, 481486.
106. Cianciaruso, B, Pota, A, Bellizzi, V, et al. (2009) Effect of a low- versus moderate-protein diet on progression of CKD: follow-up of a randomized controlled trial. Am J Kidney Dis 54, 10521061.
107. He, FJ, Marciniak, M, Visagie, E, et al. (2009) Effect of modest salt reduction on blood pressure, urinary albumin, and pulse wave velocity in white, black, and Asian mild hypertensives. Hypertension 54, 482488.
108. Slagman, MC, Kwakernaak, AJ, Yazdani, S, et al. (2012) Vascular endothelial growth factor C levels are modulated by dietary salt intake in proteinuric chronic kidney disease patients and in healthy subjects. Nephrol Dial Transplant 27, 978982.
109. Swift, PA, Markandu, ND, Sagnella, GA, et al. (2005) Modest salt reduction reduces blood pressure and urine protein excretion in black hypertensives: a randomized control trial. Hypertension 46, 308312.
110. McMahon, EJ, Campbell, KL, Bauer, JD, et al. (2015) Altered Dietary Salt Intake for People with Chronic Kidney Disease. Hoboken, NJ: John Wiley & Sons Ltd.
111. Mcclelland, R, Christensen, K, Mohammed, S, et al. (2016) Accelerated ageing and renal dysfunction links lower socioeconomic status and dietary phosphate intake. Aging 8, 11351148.
112. Kuroo, M (2013) A phosphate-centric paradigm for pathophysiology and therapy of chronic kidney disease. Kidney Int Suppl 3, 420426.
113. Finch, JL, Lee, DH, Liapis, H, et al. (2013) Phosphate restriction significantly reduces mortality in uremic rats with established vascular calcification. Kidney Int 84, 11451153.
114. Adema, AY, Borst, MHD, Wee, PMT, et al. (2014) Dietary and pharmacological modification of fibroblast growth factor-23 in chronic kidney disease. J Renal Nutr 24, 143150.
115. Langman, CB & Salusky, IB (2005) K/DOQI clinical practice guidelines for bone metabolism and disease in children with chronic kidney disease – foreword. Am J Kidney Dis 46, S6S121.
116. Selamet, U, Tighiouart, H, Sarnak, MJ, et al. (2015) Relationship of dietary phosphate intake with risk of end-stage renal disease and mortality in chronic kidney disease stages 3–5: The Modification of Diet in Renal Disease Study. Lancet 380, 16621673.
117. De-Boer, I & Rue, TB (2009) Serum phosphorus concentrations in the third national health and nutrition examination survey (NHANES III). Am J Kidney Dis 53, 399407.
118. Sullivan, C, Sayre, SS, Leon, JB, et al. (2009) Effect of food additives on hyperphosphatemia among patients with end-stage renal disease: a randomized controlled trial. JAMA 301, 629635.
119. Simmons, MN, Schreiber, MJ & Gill, IS (2008) Surgical renal ischemia: a contemporary overview. J Urol 180, 1930.