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Effects of hydration status on cognitive performance and mood

  • Natalie A. Masento (a1), Mark Golightly (a1), David T. Field (a1), Laurie T. Butler (a1) and Carien M. van Reekum (a1)...


Although it is well known that water is essential for human homeostasis and survival, only recently have we begun to understand its role in the maintenance of brain function. Herein, we integrate emerging evidence regarding the effects of both dehydration and additional acute water consumption on cognition and mood. Current findings in the field suggest that particular cognitive abilities and mood states are positively influenced by water consumption. The impact of dehydration on cognition and mood is particularly relevant for those with poor fluid regulation, such as the elderly and children. We critically review the most recent advances in both behavioural and neuroimaging studies of dehydration and link the findings to the known effects of water on hormonal, neurochemical and vascular functions in an attempt to suggest plausible mechanisms of action. We identify some methodological weaknesses, including inconsistent measurements in cognitive assessment and the lack of objective hydration state measurements as well as gaps in knowledge concerning mediating factors that may influence water intervention effects. Finally, we discuss how future research can best elucidate the role of water in the optimal maintenance of brain health and function.

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Corresponding author

* Corresponding authors:N. A. Masento, E-mail:; Dr C. M. van Reekum, fax +44 118 378 6715, E-mail:


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1 Gomez-Pinilla, F (2008) Brain foods: the effects of nutrients on brain function. Nat Rev Neurosci 9, 568578.
2 Dye, L & Blundell, J (2007) Functional foods: psychological and behavioural functions. Br J Nutr 88, Suppl. 2, S187S211.
3 Gandy, J (2012) First findings of the United Kingdom fluid intake study. Nutr Today 47, S14S16.
4 Gibson, S, Gunn, P & Maughan, RJ (2012) Hydration, water intake and beverage consumption habits among adults. Nutr Bull 37, 182192.
5 Bar-David, Y, Urkin, J, Bar-David, Z, et al. (2009) Voluntary dehydration among elementary school children residing in a hot arid environment. J Hum Nutr Diet 22, 455460.
6 Fadda, R, Rapinett, G, Grathwohl, D, et al. (2012) Effects of drinking supplementary water at school on cognitive performance in children. Appetite 59, 730737.
7 Greenleaf, JE (1992) Problem: thirst, drinking behavior, and involuntary dehydration. Med Sci Sports Exerc 24, 645656.
8 Greenleaf, JE & Sargent, F (1965) Voluntary dehydration in man. J Appl Physiol 20, 719724.
9 Passe, D, Horn, M, Stofan, J, et al. (2007) Voluntary dehydration in runners despite favorable conditions for fluid intake. Int J Sport Nutr Exerc Metab 17, 284295.
10 Thornton, SN (2010) Thirst and hydration: physiology and consequences of dysfunction. Physiol Behav 100, 1521.
11 D'Anci, K, Constant, F & Rosenberg, I (2006) Hydration and cognitive function in children. Nutr Rev 64, 457464.
12 Kenney, WL & Chiu, P (2001) Influence of age on thirst and fluid intake. Med Sci Sports Exerc 33, 15241532.
13 Begum, MN & Johnson, CS (2010) A review of the literature on dehydration in institutionalized elderly. e-Spen Eur e-J Clin Nutr Metab 5, e47e53.
14 Mentes, J (2006) Oral hydration in older adults: greater awareness is needed in preventing, recognizing, and treating dehydration. Am J Nurs 106, 4049.
15 Rolls, BJ & Phillips, PA (2009) Aging and disturbances of thirst and fluid balance. Nutr Rev 48, 137144.
16 Popkin, B, D'Anci, K & Rosenberg, I (2010) Water, hydration and health. Nutr Rev 68, 439458.
17 Wilson, MM & Morley, JE (2003) Impaired cognitive function and mental performance in mild dehydration. Eur J Clin Nutr 57, S24S29.
18 Jequier, E & Constant, F (2010) Water as an essential nutrient: the physiological basis of hydration. Eur J Clin Nutr 64, 115123.
19 EFSA (2011) Scientific opinion on the substantiation of health claims related to water and maintenance of normal physical and cognitive functions (ID 1102, 1294, 1331), maintenance of normal thermoregulation (ID 1208) and “basic requirement of all living things” (ID 1207) pursuant to Article 13(1) of Regulation (EC) No. 1924/2006. EFSA J 9, 2075.
20 EFSA (2010) Scientific opinion on dietary reference values for water: EFSA panel on dietetic products, nutrition, and allergies (NDA). EFSA J 8, 1459.
21 Cohen, D (2012) The truth about sports drinks. Br Med J 345, e4737.
22 Valtin, H (2002) Drink at least eight glasses of water a day. Really? Is there scientific evidence for “8 × 8”? Am J Physiol Regul Integr Comp Physiol 283, R993R1004.
23 Armstrong, LE (2005) Hydration assessment techniques. Nutr Rev 63, S40S54.
24 Gopinathan, PM, Pichan, G & Sharma, V (1988) Role of dehydration in heat stress-induced variations in mental performance. Arch Environ Heal 43, 1517.
25 Cian, C, Koulmann, N, Barraud, P, et al. (2000) Influence of variations in body hydration on cognitive function: effect of hyperhydration, heat stress, and exercise-induced dehydration. J Psychophysiol 14, 2936.
26 Cian, C, Barraud, P, Melin, B, et al. (2001) Effects of fluid ingestion on cognitive function after heat stress or exercise-induced dehydration. Int J Psychophysiol 42, 243251.
27 D'Anci, K, Vibhakar, A, Kanter, JH, et al. (2009) Voluntary dehydration and cognitive performance in trained college athletes. Percept Mot Skills 109, 251269.
28 Patel, AV, Mihalik, JP, Notebaert, AJ, et al. (2007) Neuropsychological performance, postural stability, and symptoms after dehydration. J Athl Train 42, 6675.
29 Lindseth, P, Lindseth, G, Petros, T, et al. (2013) Effects of hydration on cognitive function of pilots. Mil Med 178, 792798.
30 Baker, LB, Conroy, DE & Kenney, WL (2007) Dehydration impairs vigilance-related attention in male basketball players. Med Sci Sports Exerc 39, 976983.
31 Smith, MF, Newell, AJ & Baker, MR (2012) Effect of acute mild dehydration on cognitive-motor performance in golf. J Strength Cond Res 26, 30753080.
32 Petri, NM, Dropulic, N & Kardum, G (2006) Effects of voluntary fluid intake deprivation on mental and psychomotor performance. Croat Med J 47, 855861.
33 Ackland, GL, Harrington, J, Downie, P, et al. (2008) Dehydration induced by bowel preparation in older adults does not result in cognitive dysfunction. Anesth Analg 106, 924929.
34 Adam, GE, Carter, R III, Cheuvront, S, et al. (2008) Hydration effects on cognitive performance during military tasks in temperature and cold environments. Physiol Behav 93, 748756.
35 Armstrong, LE, Ganio, MS, Casa, DJ, et al. (2012) Mild dehydration affects mood in healthy young women. J Nutr 142, 382388.
36 Szinnai, G (2005) Effect of water deprivation on cognitive-motor performance in healthy men and women. Am J Physiol Regul Integr Comp Physiol 289, R275R280.
37 Ely, BR, Sollanek, KJ, Cheuvront, SN, et al. (2012) Hypohydration and acute thermal stress affect mood state but not cognition or dynamic postural balance. Eur J Appl Physiol 113, 10271034.
38 Kempton, MJ, Ettinger, U, Foster, R, et al. (2011) Dehydration affects brain structure and function in healthy adolescents. Hum Brain Mapp 32, 7179.
39 Benton, D (2011) Dehydration influences mood and cognition: a plausible hypothesis? Nutrients 3, 555573.
40 Ganio, MS, Armstrong, LE, Casa, DJ, et al. (2011) Mild dehydration impairs cognitive performance and mood of men. Br J Nutr 106, 15351543.
41 Shirreffs, SM, Merson, SJ, Fraser, SM, et al. (2004) The effects of fluid restriction on hydration status and subjective feelings in man. Br J Nutr 91, 951958.
42 Pross, N, Demazières, A, Girard, N, et al. (2012) Influence of progressive fluid restriction on mood and physiological markers of dehydration in women. Br J Nutr 109, 313321.
43 Lieberman, HR (2007) Hydration and cognition: a critical review and recommendations for future research. J Am Coll Nutr 26, 555s561s.
44 Bandelow, S, Maughan, RJ, Shirreffs, SM, et al. (2010) The effects of exercise, heat, cooling and rehydration strategies on cognitive function in football players. Scand J Med Sci Sports 20, Suppl. 3, 148160.
45 Bar-David, Y, Urkin, J & Kozminsky, E (2005) The effect of voluntary dehydration on cognitive function of elementary school children. Acta Paediatr 94, 16671673.
46 Suhr, J, Hall, J, Patterson, SM, et al. (2004) The relation of hydration status to cognitive performance in healthy older adults. Int J Psychophysiol 53, 121125.
47 Suhr, JA, Patterson, SM, Austin, AW, et al. (2010) The relation of hydration status to declarative memory and working memory in older adults. J Nutr Health Aging 14, 840843.
48 Tomporowski, P & Ellis, NR (1986) Effects of exercise on cognitive processes: a review. Psychol Bull 99, 338346.
49 Sharma, VM, Sridharan, K, Pichan, G, et al. (1986) Influence of heat-stress induced dehydration on mental functions. Ergonomics 29, 791799.
50 Lieberman, HR (2012) Methods for assessing the effects of dehydration on cognitive function. Nutr Rev 70, S143S146.
51 Edmonds, C (2012) Water, hydration state and cognitive performance. In Nutrition and Mental Performance, pp. 193212 [Riby, LM, Smith, M and Foster, J, editors]. London: Palgrave Macmillan.
52 Edmonds, CJ, Crombie, R & Gardner, MR (2013) Subjective thirst moderates changes in speed of responding associated with water consumption. Front Hum Neurosci 7, 363.
53 Kennedy, DO & Haskell, CF (2011) Cerebral blood flow and behavioural effects of caffeine in habitual and non-habitual consumers of caffeine: a near infrared spectroscopy study. Biol Psychol 86, 298306.
54 Macready, AL, Butler, LT, Kennedy, OB, et al. (2010) Cognitive tests used in chronic adult human randomised controlled trial micronutrient and phytochemical intervention studies. Nutr Res Rev 23, 200229.
55 Bourque, CW (2008) Central mechanisms of osmosensation and systemic osmoregulation. Nat Rev Neurosci 9, 519531.
56 Comijs, HS, Gerritsen, L & Penninx, WJH (2010) The association between serum cortisol and cognitive decline in older adults. Am J Geriatr Psychiatry 18, 4250.
57 Raber, J (1998) Detrimental effects of chronic hypothalamic pituitary adrenal axis activation. Mol Neurobiol 18, 122.
58 Maughan, R, Shirreffs, S & Watson, P (2007) Exercise, heat, hydration and the brain. J Am Coll Nutr 26, 604S612S.
59 Di, S & Tasker, J (2004) Dehydration-induced synaptic plasticity in magnocellular neurons of the hypothalamus supraoptic nucleus. Endocrinology 145, 51415149.
60 Gorby, HE, Brownawell, AM & Falk, MC (2010) Do specific dietary constituents and supplements affect mental energy? Review of the evidence. Nutr Rev 68, 697718.
61 Kadekaro, M, Su, G, Chu, R, et al. (2006) Nitric oxide up-regulates the expression of calcium-dependent potassium channels in the supraoptic nuclei and neural lobe of rats following dehydration. Neurosci Lett 404, 5055.
62 Ueta, Y, Levy, A, Chowdrey, H, et al. (1995) Water deprivation in the rat induces nitric oxide synthase (NOS) gene expression in the hypothalamic paraventricular and supraoptic nuclei. Neurosci Res 23, 317319.
63 Toda, N & Okamura, T (2010) Modulation of renal blood flow and vascular tone by neuronal nitric oxide synthase-derived nitric oxide. J Vasc Res 48, 110.
64 Rogers, PJ, Kainth, A & Smit, HJ (2001) A drink of water can improve or impair mental performance depending on small differences in thirst. Appetite 36, 5758.
65 Neave, N, Scholey, AB, Emmett, JR, et al. (2001) Water ingestion improves subjective alertness, but has no effect on cognitive performance in dehydrated healthy young volunteers. Appetite 37, 255256.
66 Edmonds, CJ, Crombie, R, Ballieux, H, et al. (2013) Water consumption, not expectancies about water consumption, affects cognitive performance in adults. Appetite 60, 148153.
67 Booth, P, Taylor, B & Edmonds, C (2012) Water supplementation improves visual attention and fine motor skills in school children. Educ Health 30, 7579.
68 Edmonds, C & Burford, D (2009) Should children drink more water? The effects of drinking water on cognition in children. Appetite 52, 776779.
69 Edmonds, C & Jeffes, B (2009) Does having a drink help you think? 6–7 year old children show improvements in cognitive performance from baseline to test after having a drink of water. Appetite 53, 469472.
70 Field, DT, Williams, CM & Butler, LT (2011) Consumption of cocoa flavanols results in an acute improvement in visual and cognitive function. Physiol Behav 103, 255260.
71 Benton, D & Burgess, N (2009) The effect of the consumption of water on the memory and attention of children. Appetite 53, 143146.
72 Pawson, C, Gardner, MR, Doherty, S, et al. (2013) Drink availability is associated with enhanced examination performance in adults. Psychol Teach Rev 19, 5767.
73 Brunstrom, J & Macrae, A (1997) Effects of temperature and volume on measures of mouth dryness, thirst and stomach fullness in males and females. Appetite 29, 3142.
74 Labbe, D, Martin, N, Le Coutre, J, et al. (2011) Impact of refreshing perception on mood, cognitive performance and brain oscillations: an exploratory study. Food Qual Prefer 22, 92100.
75 Saltmarsh, M (2001) Thirst: or, why do people drink? Nutr Bull 26, 5358.
76 Labbe, D, Almiron-Roig, E, Hudry, J, et al. (2009) Sensory basis of refreshing perception: role of psychophysiological factors and food experience. Physiol Behav 98, 19.
77 Bateman, DN (1982) Effects of meal temperature and volume on the emptying of liquid from the human stomach. J Physiol 331, 461467.
78 Lambert, CP, Ball, D, Leiper, JB, et al. (1999) The use of deuterium tracer technique to follow the fate of fluids ingested by human subjects: effects of drink volume and tracer concentration and content. Exp Physiol 84, 391399.
79 Péronnet, F, Mignault, D, du Souich, P, et al. (2012) Pharmacokinetic analysis of absorption, distribution and disappearance of ingested water labeled with D2O in humans. Eur J Appl Physiol 112, 22132222.
80 Cohen, S (1983) After effects of stress on human performance during a heat acclimatization regimen. Aviat Space Environ Med 54, 709713.
81 Baars, B (1993) How does a serial, integrated and very limited stream of consciousness emerge from a nervous system that is mostly unconscious, distributed, parallel and of enormous capacity? Ciba Found Symp 174, 282290.
82 May, M & Jordan, J (2011) The osmopressor response to water drinking. Am J Physiol Regul Integr Comp Physiol 300, R40R46.
83 Schroeder, C, Bush, VE, Norcliffe, LJ, et al. (2002) Water drinking acutely improves orthostatic tolerance in healthy subjects. Circulation 106, 28062811.
84 Gold, PE (1995) Role of glucose in regulating the brain and cognition. Am J Clin Nutr 61, 987S995S.
85 Kashihara, K, Maruyama, T, Murota, M, et al. (2009) Positive effects of acute and moderate physical exercise on cognitive function. J Physiol Anthropol 28, 155164.
86 Ainslie, PN, Campbell, IT, Frayn, KN, et al. (2012) Energy balance, metabolism, hydration, and performance during strenuous hill walking: the effect of age. J Appl Physiol 93, 714723.
87 Kempton, MJ, Ettinger, U, Schmechtig, A, et al. (2009) Effects of acute dehydration on brain morphology in healthy humans. Hum Brain Mapp 30, 291298.
88 Serwah, N & Marino, FE (2006) The combined effects of hydration and exercise heat stress on choice reaction time. J Sci Med Sport 9, 157164.
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