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Evaluating the effect of Brainfood groups for people with mild cognitive impairment and mild dementia: preliminary mixed-methodology study

Published online by Cambridge University Press:  27 June 2018

Saba Hassan
Affiliation:
UCL Department of Old Age Psychiatry, Division of Psychiatry, University College London, UK
Elisa Aguirre
Affiliation:
Research and Development Department, North East London Foundation Trust (NELFT), Goodmayes Hospital, UK
Anna Betz
Affiliation:
Camden and Islington NHS Foundation Trust, Services for Ageing and Mental Health, Peckwater Centre, UK
Sarah Robertson
Affiliation:
UCL Department of Old Age Psychiatry, Division of Psychiatry, University College London, UK
Deepak Sankhla
Affiliation:
North East London Foundation Trust, Redbridge Memory Service & Neuropsychological Pathway, Community Care Advice Centre, UK
Claudia Cooper*
Affiliation:
UCL Department of Old Age Psychiatry, Division of Psychiatry, University College London and Camden and Islington NHS Foundation Trust, Services for Ageing and Mental Health, Peckwater Centre, UK
*
Correspondence Claudia Cooper, UCL Department of Old Age Psychiatry, Division of Psychiatry, Wing A, Floor 6 Maple House, 149 Tottenham Court Rd, London W1T 7NF, UK. Email: claudia.cooper@ucl.ac.uk
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Abstract

Background

Brainfood is a 5-week group intervention for people with mild cognitive impairment and mild dementia, promoting cognitive health through a Mediterranean-style diet, exercise, mindfulness and health self-management.

Aims

To evaluate Brainfood acceptability and the feasibility of conducting a randomised controlled trial; in a single group study in two National Health Service (NHS) memory services.

Method

Participants self-completed quantitative and semi-structured questionnaires. Recruitment, attendance and outcome completion were the primary outcomes.

Results

In total, 30 of 59 people invited to Brainfood attended; of the 26 (87%) who completed baseline measures: 25 (96%) completed post-intervention quantitative measures, 16 (67%) qualitative questions and 21 (81%) attended ≥3/5 sessions. Compared with baseline, participants reported significantly higher quality of life, Mediterranean diet adherence and exercising more, up to 2 months after the groups. Participants valued the groups and felt enabled to improve their well-being.

Conclusions

Brainfood was acceptable and feasible to implement in an NHS setting.

Declaration of interest

A.B. and C.C. developed Brainfood – they hold a creative commons license for the manual and make it available to use for free to all. The manual evolves iteratively, but the manual used in this research study is provided in an online supplement.

Type
Papers
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Royal College of Psychiatrists 2018

In total, 815 000 people live with dementia in the UK.Reference Prince, Knapp, Guerchet, McCrone, Prina and Comas-Herrera1 The 2013 G8 Dementia summit identified preventative lifestyle changes as critical to the global dementia response: its prevalence would be halved if onset were delayed 5 years.Reference Jorm, Korten and Henderson2 The 2017 Lancet Commission on Dementia prevention, intervention and care encouraged researchers and policymakers to be ‘ambitious about prevention’; and suggested interventions enabling lifestyle change may have the potential to prevent or delay dementia. Memory services are potentially well placed to promote strategies to prevent dementia in people with mild cognitive impairment (MCI), and treat cognitive and behavioural symptoms in those already diagnosed. MCI is a heterogeneous state between normal ageing and early dementia. Its differentiation from dementia is primarily determined by the preservation of functional activities.Reference Petersen3 It affects 19% of people aged 65 and over.Reference Lopez, Kuller, Becker, Dulberg, Sweet and Gach4 Around 46% of people with MCI develop dementia within 3 years compared with 3% of the non-MCI population of the same age.Reference Tschanz, Welsh-Bohmer, Lyketsos, Corcoran, Green and Hayden5 More people are being diagnosed with MCI in Western countries as campaigns promote early presentation with memory problems to avoid crisis, but we know little about how to treat it. The National Institute for Health and Clinical Excellence recommends follow-up to ensure dementia is diagnosed and care planned at an early stage, but no specific treatments.6

Lifestyle changes to prevent dementia

The USA National Institute of Health recommends intervention trials for dementia prevention encompassing multiple risk factors.Reference Kivipelto, Solomon, Ahtiluoto, Ngandu, Lehtisalo and Antikainen7 In the Finnish Geriatric Intervention Study to Prevent Cognitive Impairment and Disability (FINGER) randomised controlled trial (RCT), an expert-led intervention that promoted healthy diet, increased physical activity, daily cognitive training, social engagement and monitoring and maintenance of metabolic and vascular factors, reduced cognitive impairment in people at increased dementia risk, with and without MCI.Reference Kivipelto, Solomon, Ahtiluoto, Ngandu, Lehtisalo and Antikainen7, Reference Ngandu, Lehtisalo, Solomon, Levalahti, Ahtiluoto and Antikainen8 There is evidence that a high-fat diet leads to cognitive decline associated with decreased synaptic plasticity and decreased expression of cognitive-related proteins in hippocampi of rats;Reference Woo, Shin, Park, Jang and Kang9 whereas in obese people with MCI, cognitive improvements are correlated with intentional weight loss.Reference Horie, Serrao, Simon, Gascon, Dos Santos and Zambone10 A meta-analysis has demonstrated improvements in cognition with aerobic exercise in healthy adults and people with MCI;Reference Smith, Blumenthal, Hoffman, Cooper, Strauman and Welsh-Bohmer11 and resistance training improved cognition in people with MCI in one RCT.Reference Fiatarone Singh, Gates, Saigal, Wilson, Meiklejohn and Brodaty12

Several mechanisms might explain the association between healthy lifestyle and better cognitive function. Diabetes and metabolic syndrome are associated with stroke and vascular problems. Impaired insulin receptor activation in Alzheimer's disease might explain the association between diabetes and Alzheimer's disease. Eating a Mediterranean-style diet (low in sugar and carbohydrates, meat and dairy; high in vegetables, fruit, fish, pulses and legumes) is associated with fewer vascular risk factors, and reduced plasma glucose and serum insulin levels, insulin resistance and markers of oxidative stress and inflammation.Reference Sofi, Cesari, Abbate, Gensini and Casini13 Exercise is neuroprotective; it promotes brain derived neurotrophic factor release, reducing cortisol and vascular risk.Reference Vaughan, Wallis, Polit, Steele, Shum and Morris14

As the brain pathology that causes symptoms in dementia is inherently similar to that in MCI, people with mild dementia may also benefit from interventions promoting positive dietary and other lifestyle changes. Currently no evidence-based, lifestyle-focused interventions exist for people with dementia, nor are any such interventions available for people with MCI in a potentially cost-effective and scalable format. Addressing eating and drinking difficulties of people living with dementia was rated a research priority by people with dementia and their carers.Reference Kelly, Lafortune, Hart, Cowan, Fenton and Brayne15 People with dementia are more likely to be dehydrated and malnourished. The review, which included 43 controlled studies rated to be at high risk of bias, most situated in care homes, concluded that there is currently no good-quality evidence about how to improve intake. Social interventions (for example, promoting family-style mealtimes) were small but consistently indicated that such approaches improved autonomy, communication, mood, involvement and participation in meaningful activity in the context of food and drink.Reference Abdelhamid, Bunn, Copley, Cowap, Dickinson and Gray16 An intervention in people with dementia living in a Danish nursing home that involved oral nutritional supplements, oral care and group exercises improved energy intake and social and physical (although not cognitive) functioning relative to the control group.Reference Beck, Damkjaer and Sorbye17

Developing Brainfood intervention

We (A.B. and C.C.) developed Brainfood, a five-group session intervention promoting lifestyle change in 2013. We based the content on systematic review findings.Reference Cooper, Li, Lyketsos and Livingston18, Reference Cooper, Sommerlad, Lyketsos and Livingston19 After piloting the intervention within the memory service, we refined it using feedback from people with MCI and dementia and their family carers. The groups are offered to people with MCI and mild dementia attending several London National Health Service (NHS) memory services. Although the groups are based on best current evidence, there is no evidence regarding whether they successfully enable change in participants’ dietary and exercise behaviours or improve their well-being. We aimed to evaluate the acceptability of this low-intensity intervention and the feasibility of testing it in a pragmatic RCT. To address these aims, we set three primary objectives:

  1. (a) to determine the proportion of people attending the groups completing baseline and follow-up measures and those attending at least three of five sessions;

  2. (b) to measure change on our a priori primary outcome, EQ-5D quality of life score post-intervention; and

  3. (c) to explore using qualitative methods whether and how attending Brainfood groups enabled positive lifestyle changes.

Method

Recruitment and procedures

Participants in this single group study were recruited from two memory services (inner and outer London). People diagnosed with MCI or dementia in the services were asked by clinicians if they would be interested in attending Brainfood groups. They were invited to do so alone, with a family carer or if more appropriate to their circumstances, the family carer attended on their behalf. Potential attendees were advised that the person who makes decisions about shopping and meal preparation for the person with cognitive impairment should attend. Taxis were provided at the outer London site for those who needed them, but this was not possible at the inner London site. Participants were given the dates of the groups in advance and a telephone reminder on the day of each group.

All questionnaires were administered by S.H.; S.H. was not involved in delivering the group sessions. People who joined the Brainfood groups at the first or second session were invited to take part in the research. Those declining participation in the research study were nonetheless invited to attend the groups. All research participants gave written, informed consent, then completed baseline measures immediately prior to the first session they attended. Participants were asked to complete outcome measures immediately after the final group session. S.H. visited participants at home, or the clinic if they preferred, to complete other post-intervention follow-up interviews, or completed the measures by phone where participants preferred this. Lack of capacity to take part in the study was an exclusion criterion, but no participants were excluded for this reason. Yorkshire and the Humber – Sheffield National Research Ethics Committee (16/YH/0456) approved the study.

Quantitative measures

We recorded the proportion of people invited to Brainfood who attended and who took part in the study; whether participants attended alone or with a family member, or if the carer attended alone. At baseline, post-intervention and the 2-month follow-up the following measures were self-completed by participants, with family carer support in some cases, or by proxy if the carer attended alone.

  1. (a) The EQ-5D: a reliable and valid visual analogue scale to measure health-related quality of life; lower scores indicate poorer quality of life.Reference Kunz20

  2. (b) The Geriatric Depression Scale: a 15-item, valid and reliable self-report assessment used to identify depression in older people.Reference Montorio and Izal21

  3. (c) A revised-short version of the Mediterranean diet score: a measure assessing the consumption of elements included in the Mediterranean diet, for example olive oil, wine, fruits, legumes and whole-grain intake. Low consumption of meat, coffee, commercial sweets and fizzy drinks is included and reverse scored. Higher scores indicate greater adherence to the diet. We used the short Mediterranean diet score, which has content, concurrent and predictive validity.Reference Martinez-Gonzalez, Fernandez-Jarne, Serrano-Martinez, Wright and Gomez-Gracia22, Reference Martinez-Gonzalez, Garcia-Arellano, Toledo, Salas-Salvado, Buil-Cosiales and Corella23 In previous studies, it has been adapted for local diets: we added additional items on intake of commercial sweets, biscuits, cakes and pastries and sweetened and fizzy groups used previously.Reference Zazpe, Sanchez-Tainta, Estruch, Lamuela-Raventos, Schroder and Salas-Salvado24 We evaluated content validity within the team and added two further items to ask participants whether they drank water with every meal and more than five cups of coffee daily.

We also asked participants to list the type, frequency and duration of exercise they undertook in the past week. We calculated the total number of hours of exercise. We asked about the number of alcohol units consumed in the preceding week. At follow-up we asked whether or not they had made any lifestyle changes because of Brainfood, with yes/no as possible responses.

We recorded, from clinical notes at baseline: diagnosis; whether antidementia medication was prescribed; whether or not they were attending cognitive stimulation therapy and their most recent score on Addenbrooke's Cognitive Examination III-Revised Version and the date of test; this assesses a range of cognitive domains and differentiates well between those with and without cognitive impairment.Reference Mathuranath, Nestor, Berrios, Rakowicz and Hodges25

Qualitative questionnaire

At follow-up the questionnaires included the open-ended questions: ‘What changes have you made because of Brainfood?’ and ‘Are there any other changes you have made?’

Brainfood intervention

Brainfood comprises five group sessions held weekly or fortnightly at the memory services. Sessions are fully manualised and participants receive a manual to keep, and to record their personal goals. The groups were facilitated by: a social worker (A.B.) and a psychology graduate (S.R.) at memory service one; a health psychologist (E.A.) and clinical psychologist (D.S.) at memory service two. They covered: session one: eating regular meals, having a good breakfast, the importance of exercise; session two: good and bad carbohydrates and making social connections; session three: good and bad fats and looking after physical health; session four: Mediterranean diet and impact of alcohol; session five: putting it all together. All sessions involved tasting and sharing foods relevant to the sessions and included a brief mindfulness exercise that participants were encouraged to practice at home. Participants were guided to identify personal goals for behaviour change to try out between sessions; participants iteratively developed a personal action plan over the five sessions. The intervention manual is included as an online supplement (See Supplementary Document 1, available at https://doi.org/10.1192/bjo.2018.29).

Analysis

We used SPSS version 24 to analyse quantitative data. We used descriptive statistics to summarise data. We reported the percentage of people invited to groups who attended, who took part in the study and completed outcomes; and the number of sessions attended. We assessed distribution of outcome variables and log-transformed data that was excessively skewed (skewness >1 or <−1). We used univariate paired t-tests to compare outcomes at baseline and follow-up; with last-observation-carried-forward to account for the one participant with missing follow-up data. Our sample size was based on the objective of providing estimates of intervention adherence and study recruitment for a future trial.

S.H., C.C. and S.R. reviewed participants’ responses to open-ended questions and undertook the qualitative analysis based on methodology described by Braun & Clarke.Reference Braun and Clarke26 They identified themes independently that responded to the qualitative research question: what changes had the participants noted that they attributed to the group attendance? We used Pender's theory of health promotion as a framework for analyses, mapping identified themes to the components of this model: personal characteristics and experiences, perceived benefits and barriers to action, perceived self-efficacy and interpersonal and situation influences, and behavioural outcomes.Reference Raffaele, Matarese, Alvaro and De Marinis27, Reference Pender, Barkauskas, Hayman, Rice and Anderson28

Results

Study participation

A total of 59 potentially eligible people were invited to participate in Brainfood and expressed an initial interest during the study period. Thirty (51%) of these people attended the initial or second Brainfood session. All were screened as being potentially eligible and 26 (87%) agreed to take part in the study and completed baseline measures. The four attendees who did not take part arrived late and were either not invited to take part because S.H. had left the clinic or did not want to complete the questionnaires before the session because they would miss the group that was already underway. Of 26 participants at baseline 25 (96%) completed all post-intervention quantitative measures; one participant refused to complete either follow-up interview. Participation rates were broadly similar between memory service one and memory service two.

Of the participants, 17 (65%) attended sessions alone; 8 (31%) attended with a family member (7 with a spouse and one with an adult child), of whom 4 had a diagnosis of MCI and 4 had a diagnosis of dementia. For one participant, the family carer attended sessions alone, and proxy-completed the questionnaires on behalf of the person they were caring for who had dementia.

Intervention participation

Groups took place between January and August 2017. In total, 21 of the 26 (81%) participants attended at least three out of the five sessions. Five people attended two sessions, four people attended three sessions, seven people attended four sessions and ten people attended five sessions. We recruited 14 (54%) of participants from memory service one (in which the participants took part in three cohorts each with five, three and six participants) and the remaining 12 (46%) from memory service two, who took part as one group.

Participant characteristics

Thirteen (50%) of participants had a diagnosis of MCI; 12 (46%) had a diagnosis of dementia and one (4%) participant did not consent to us obtaining clinical information from medical records. For those for whom their Addenbrooke's Cognitive Examination III score was available in the last year before baseline, the mean score was 82.9 (s.d. = 10.2, n = 11) in participants with MCI and 79.7 (s.d. = 12.7, n = 10.2) in participants with dementia; the overall range of scores was 50–95. Thirteen (50%) participants were women. In total, 5 (19%) were attending Cognitive Stimulation Therapy at baseline; and 8 (31%) were taking antidementia medication at baseline.

Quantitative outcomes

We log-transformed data on the amount of exercise taken and Geriatric Depression Scale scores, and resulting data was within our predetermined limits for conducting parametric analyses (skewness >−1 and <1) (Table 1).

Table 1 Scores for study outcomes

Log, log-transformed scores.

a. For one participant, we used last-intervention-carried-forward as they did not complete follow-up interviews.

Bold denotes significance P < 0.05.

Well-being measures

EQ-5D scores increased between baseline and immediate post-intervention follow-up, and between baseline and follow-up 2 months post-intervention (Table 1). Geriatric Depression Scale scores did not change significantly over these time periods.

Lifestyle measures

Post-intervention, 21 (84%) of participants with data reported that they had made changes because of Brainfood, and the same participants reported that they had sustained these changes 2 months later. Mediterranean diet scores increased significantly between baseline and post-intervention and 2-month follow-up, indicating greater adherence to Mediterranean diet over time (Table 1). In a post hoc analysis, greater mean change on the Mediterranean diet score was reported by people with dementia compared with those with MCI (3.7 v. 0.9) and by those attending with a carer (2.8 v. 1.5).

Walking, dancing and flexibility exercises were the main types of exercise reported. The amount of exercise reported increased from baseline to 2 months follow-up, but not between baseline and the immediate post-intervention. At baseline, 17 (65%) of participants drank no alcohol, 7 drank between one and ten units of alcohol a week, and two did not answer. None of the participants reported increased alcohol intake at subsequent post-intervention or 2-month follow-ups.

Process evaluation and qualitative analysis

Of the 26 participants, 16 (62%) responded to the qualitative questions at the first follow-up and 12 of 21 (57%) responded to the qualitative questions at both follow-up points; with other respondents leaving the questions blank or writing ‘none’. Data saturation was attained with no new themes arising in the final three questionnaires analysed.

We identified nine subthemes, which we fitted within five themes informed by Pender's health promotion model: personal characteristics, perceived benefits to action, perceived self-efficacy, interpersonal and situation influences and behavioural outcomes. These are displayed in Table 2, with example quotes illustrating each theme, divided by diagnosis and discussed below.

Table 2 Summary of qualitative framework analysis resultsa with example quotes

FU1, first follow-up; FU2, second follow-up.

a. Informed by Pender's health promotion model.

b. Same participant; other quotes within themes are from different participants.

Personal experiences

The only personal experience that was identified as influencing response to the groups was existing knowledge. Three participants (including people with MCI and dementia) indicated that the extent to which the sessions changed their behaviour was limited by the degree of accord between lifestyle changes suggested and their current practices.

Perceived benefits of action

Several of the participants reported that the groups increased their awareness of the perceived benefits of the targeted behaviour changes. This was most frequently discussed in relation to dietary change. One participant with dementia explained they were more aware of the ‘impact of varied and healthy foods on memory and well-being’ after attending the groups. A second participant with MCI reported increased awareness of the importance of ‘variation in diet’.

Perceived self-efficacy

Narratives of participants (at first (FU1) and second follow-up (FU2)) with MCI and dementia suggested that the groups had increased their understanding of diet as an active choice. One person with dementia spoke of how they understood more about the benefits of different food choices:

‘Understanding greatly increased the choices to include in eating and the benefits they make.’ (FU1)

A participant with MCI spoke of an intention to use the manuals as a resource when planning diet:

‘I will keep my 5 booklets and refer to them to enable me to correct my diet.’ (FU1)

One participant described (at both time points) how the groups had led to an understanding that despite having a cognitive disorder, they could still make changes that could improve their well-being:

‘My attitude to what is still possible despite my medical condition.’ (FU1)

‘My attitude has changed towards my health problems and I see how a healthier diet can help my sleep.’ (FU2)

Interpersonal and situation influences

Five participants, including people with dementia and MCI, reported enjoying or benefiting from the opportunity to meet together to share ideas, and the social aspect of the groups:

‘Wonderful workshop…thoroughly enjoyed meeting people who go through similar problems and learning about my problems in detail.’ (FU2)

This continued even after the 2-month follow-up, in which some participants decided to meet informally.

‘Nice meeting new people who undergo similar things, some of us are still in contact.’ (FU2)

Behavioural outcomes

Participants described making changes to how they ate, with participants with dementia and MCI making references to having more home-cooked meals and enjoying learning how to implement their understanding from the group in the meals they cooked:

‘Enjoyed Mediterranean food throughout life but was nice to learn about how to incorporate it for home cooked meals.’ (FU1)

One participant with MCI also described seeking out new places to buy food:

‘Familiarised myself with healthy food suppliers.’ (FU1)

Most (n = 15) participants described making and sustaining dietary changes recommended in the groups. For example, a participant with dementia described the following dietary changes:

‘Cut down on sugar. Pumpkin seeds, nuts instead of sweets, cut down on sugar, much more lemon.’ (FU1)

One participant mentioned ‘joining the gym’, and another described how mindfulness ‘helped with sleep’.

Discussion

Main findings

The Brainfood group intervention was accepted by participants, most of whom reported positive behaviour changes. Dietary change was most targeted in the groups, and most reported behaviour change was in this area. Facilitators of change appeared to be an increasing awareness of how the targeted lifestyle changes might improve their well-being, increased self-efficacy and awareness of diet being an active choice, which can influence well-being and positive social experiences in the group. In quantitative analyses, we found that reported Mediterranean-style dietary adherence, exercise and health-related quality of life increased compared with baseline up to 2 months follow-up post-intervention. Changes in depression scores over time were not significant but in the expected direction. Over half of the potential participants who expressed an interest in attending did so, and 80% of study participants attended three of five groups. As many faced barriers to attending including memory loss, physical illness and difficulties arranging transport (on one site), this is promising.

Interpretation of our findings

Although our findings must be interpreted cautiously in this small, uncontrolled study, they suggest that the groups may have enabled meaningful lifestyle changes. This is the first study, to our knowledge, to evaluate an intervention to enable behaviour change in people with dementia and MCI, without a regular family carer acting as study partner. Even without a family carer to support implementation, people with mild dementia appeared able to use the sessions to make changes to lifestyle; our experiences suggested that the intervention manual was important in enabling this. We cannot determine the mechanisms, but previous studies report that Mediterranean dietReference Perez-Lopez, Chedraui, Haya and Cuadros29 and increased exerciseReference Ojagbemi and Akin-Ojagbemi30 are associated with increased quality of life, possibly mediated by improved physical, mental or social well-being or increased self-efficacy.Reference Inouye, Pedrazzani, Pavarini and Toyoda31 The intervention involved supporting participants to make choices and personal plans for change. Perhaps this approach communicated that independence is possible despite memory loss. Participants valued the social experience. Where family carers attended, their experiences may have influenced the care recipients’ quality of life as family carer and care recipient quality of life are interlinked.Reference Farina, Page, Daley, Brown, Bowling and Basset32 We did not measure family carer quality of life and would do so in a future trial.

A systematic review of eight interventions to promote healthy diet in older people without cognitive impairment found that interventions involving more than one session and focusing on specific changes, for example increasing fruit and vegetable intake were more effective. Only three of the interventions reviewed were explicitly based on a health promotion theory; these included Pender's health promotion model.Reference Raffaele, Matarese, Alvaro and De Marinis27 In our framework analysis based on Pender's model, we identified that perceived benefits, self-efficacy and interpersonal relationships were likely drivers of the behavioural outcomes we recorded. Pender's model also includes barriers to behavioural change, but we did not identify description of barriers to action in the participants’ responses. Perhaps people with dementia or MCI attending groups and responding to the open-ended questions experienced fewer barriers to implementing recommended changes than those who did not attend or respond, or perhaps our open-ended questions did not adequately prompt participants to report them.

Strengths and limitations

This was an exploratory, pilot study designed to work within current NHS service provision, with broad inclusion criteria and brief outcome interviews. There was no control group. Outcome measures were self-completed, but may have been influenced by social desirability bias. Some participants attended with family members who were usually present when they completed measures and may have influenced ratings or assisted recall. In one case, a family carer attended alone and proxy completed the measures. There are systematic differences in how family carers and people living with dementia rate quality of life,Reference Moyle, Murfield, Griffiths and Venturato33 so this is a limitation. We think that opening this trial to people with and without a family carer was also a strength, as people with dementia without a family carer are rarely included in research developing interventions designed for them to use.Reference Cooper, Ketley and Livingston34 Although the follow-up period was too brief to evaluate changes in cognitive function, this would be an important outcome in a future trial, as higher Mediterranean dietary adherence is associated with a reduced dementia risk.Reference Singh, Parsaik, Mielke, Erwin, Knopman and Petersen35

Implications

Our intervention was conceived because people with mild dementia and MCI attending our memory services wanted more information about how lifestyle changes might improve their symptoms, so we included both these diagnostic groups in the study. The Mediterranean diet score has been used in populations with cognitive impairment,Reference Martinez-Gonzalez, Garcia-Arellano, Toledo, Salas-Salvado, Buil-Cosiales and Corella23 but not in people with mild dementia. Participants with mild dementia had similar cognitive function to those with MCI, but a more homogenous population would arguably be preferable in a future pragmatic study as mechanisms for enabling behavioural change may differ in people with dementia who were by definition experiencing functional impairment. In our post hoc analysis, Mediterranean diet adherence increased more in people with mild dementia compared with those with MCI. We focused the intervention on how to help cognitive symptoms rather than on diagnosis. Perhaps participants with mild dementia particularly benefited from this approach because promoting self-efficacy and independence challenges the commonly held belief that as cognitive decline in dementia is inevitable, it is too late to make positive life changes. Perhaps people with dementia were more highly motivated to change, or their carers were more motivated to support them to implement changes.

Brainfood groups were offered in additional to all available usual care. There are no other groups routinely available in either trust that specifically promote Mediterranean dietary adherence or exercise, which were our main outcomes of behavioural change, so we do not think that attendance at other groups could have accounted for the changes we saw on these measures. We recorded and report attendance at cognitive stimulation groups at baseline, as these were the only groups offered (only to people with dementia) within the clinical services involved in the study during the study period.

In conclusion, this pilot study demonstrated that Brainfood, a psychosocial intervention to promote healthy diet, exercise and mindfulness in people with MCI and mild dementia was feasible to implement in a real-world NHS setting. Dietary change was most targeted in the groups, and most reported behaviour change was in this area. Facilitators of change appeared to be an increasing awareness of how the targeted lifestyle changes might improve their well-being, increased self-efficacy and awareness of diet being an active choice, which can influence well-being and positive social experiences in the group. Evaluation of the intervention in a randomised controlled trial is now planned.

Funding

This research was supported financially by a small Royal College of Psychiatrists, General Adult Faculty research fund award to E.A. Research was conducted at University College London. S.R. was partly supported by the National Institute for Health Research (NIHR) Collaboration for Leadership in Applied Health Research and Care (CLAHRC) North Thames. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health. C.C. is supported by the UCLH NIHR Biomedical Research Centre.

Acknowledgements

We would like to thank the Royal College of Psychiatrists, Camden and Islington NHS Foundation Trust and North East London Foundation Trust (NELFT).

Supplementary material

Supplementary material is available online at https://doi.org/10.1192/bjo.2018.29

References

1.Prince, M, Knapp, M, Guerchet, M, McCrone, P, Prina, M, Comas-Herrera, A, et al. Dementia UK: Update. Alzheimer's Society 2014 (https://www.alzheimers.org.uk/sites/default/files/migrate/downloads/dementia_uk_update.pdf).Google Scholar
2Jorm, AF, Korten, AE, Henderson, AS. The prevalence of dementia - a quantitative integration of the literature. Acta Psychiatr Scand 1987; 76: 465–79.CrossRefGoogle ScholarPubMed
3Petersen, RC. Mild cognitive impairment as a diagnostic entity. J Intern Med 2004; 256: 183–94.CrossRefGoogle ScholarPubMed
4Lopez, OL, Kuller, LH, Becker, JT, Dulberg, C, Sweet, RA, Gach, HM, et al. Incidence of dementia in mild cognitive impairment in the cardiovascular health study cognition study. Arch Neurol 2007; 64: 416–20.CrossRefGoogle ScholarPubMed
5Tschanz, JT, Welsh-Bohmer, KA, Lyketsos, CG, Corcoran, C, Green, RC, Hayden, K, et al. Conversion to dementia from mild cognitive disorder – The Cache County Study. Neurology 2006; 67: 229–34.CrossRefGoogle ScholarPubMed
6National Institute for Health and Care Excellence. Dementia: Supporting People with Dementia and Their Carers in Health and Social Care. Clinical Guidance: CG42. NICE, 2006.Google Scholar
7Kivipelto, M, Solomon, A, Ahtiluoto, S, Ngandu, T, Lehtisalo, J, Antikainen, R, et al. The Finnish Geriatric Intervention Study to Prevent Cognitive Impairment and Disability (FINGER): study design and progress. Alzheimers Dement 2013; 9: 657–65.CrossRefGoogle ScholarPubMed
8Ngandu, T, Lehtisalo, J, Solomon, A, Levalahti, E, Ahtiluoto, S, Antikainen, R, et al. A 2 year multidomain intervention of diet, exercise, cognitive training, and vascular risk monitoring versus control to prevent cognitive decline in at-risk elderly people (FINGER): a randomised controlled trial. Lancet 2015; 385: 2255–63.CrossRefGoogle Scholar
9Woo, J, Shin, KO, Park, SY, Jang, KS, Kang, S. Effects of exercise and diet change on cognition function and synaptic plasticity in high fat diet induced obese rats. Lipids Health Dis 2013; 12: 144.CrossRefGoogle ScholarPubMed
10Horie, NC, Serrao, VT, Simon, SS, Gascon, MR, Dos Santos, AX, Zambone, MA, et al. Cognitive effects of intentional weight loss in elderly obese individuals with mild cognitive impairment. J Clin Endocrinol Metab 2016; 101: 1104–12.CrossRefGoogle ScholarPubMed
11Smith, PJ, Blumenthal, JA, Hoffman, BM, Cooper, H, Strauman, TA, Welsh-Bohmer, K, et al. Aerobic exercise and neurocognitive performance: a meta-analytic review of randomized controlled trials. Psychosom Med 2010; 72: 239–52.CrossRefGoogle ScholarPubMed
12Fiatarone Singh, MA, Gates, N, Saigal, N, Wilson, GC, Meiklejohn, J, Brodaty, H, et al. The Study of Mental and Resistance Training (SMART) study-resistance training and/or cognitive training in mild cognitive impairment: a randomized, double-blind, double-sham controlled trial. J Am Med Dir Assoc 2014; 15: 873–80.CrossRefGoogle ScholarPubMed
13Sofi, F, Cesari, F, Abbate, R, Gensini, GF, Casini, A. Adherence to Mediterranean diet and health status: meta-analysis. Br Med J 2008; 337: a1344.CrossRefGoogle ScholarPubMed
14Vaughan, S, Wallis, M, Polit, D, Steele, M, Shum, D, Morris, N. The effects of multimodal exercise on cognitive and physical functioning and brain-derived neurotrophic factor in older women: a randomised controlled trial. Age Ageing 2014; 43: 623–9.CrossRefGoogle ScholarPubMed
15Kelly, S, Lafortune, L, Hart, N, Cowan, K, Fenton, M, Brayne, C, et al. Dementia priority setting partnership with the James Lind Alliance: using patient and public involvement and the evidence base to inform the research agenda. Age Ageing 2015; 44: 985–93.CrossRefGoogle Scholar
16Abdelhamid, A, Bunn, D, Copley, M, Cowap, V, Dickinson, A, Gray, L, et al. Effectiveness of interventions to directly support food and drink intake in people with dementia: systematic review and meta-analysis. BMC Geriatr 2016; 16: 26.CrossRefGoogle ScholarPubMed
17Beck, AM, Damkjaer, K, Sorbye, LW. Physical and social functional abilities seem to be maintained by a multifaceted randomized controlled nutritional intervention among old (>65 years) Danish nursing home residents. Arch Gerontol Geriatr 2010; 50: 351–5.CrossRefGoogle ScholarPubMed
18Cooper, C, Li, R, Lyketsos, C, Livingston, G. Treatment for mild cognitive impairment: systematic review. Br J Psychiatry 2013; 203: 255–64.CrossRefGoogle ScholarPubMed
19Cooper, C, Sommerlad, A, Lyketsos, CG, Livingston, G. Modifiable predictors of dementia in mild cognitive impairment: a systematic review and meta-analysis. Am J Psychiatry 2015; 172: 323–34.CrossRefGoogle ScholarPubMed
20Kunz, S. Psychometric properties of the EQ-5D in a study of people with mild to moderate dementia. Qual Life Res 2010; 19: 425–34.CrossRefGoogle Scholar
21Montorio, I, Izal, M. The geriatric depression scale: a review of its development and utility. Int Psychogeriatr 1996; 8: 103–12.CrossRefGoogle Scholar
22Martinez-Gonzalez, MA, Fernandez-Jarne, E, Serrano-Martinez, M, Wright, M, Gomez-Gracia, E. Development of a short dietary intake questionnaire for the quantitative estimation of adherence to a cardioprotective Mediterranean diet. Eur J Clin Nutr 2004; 58: 1550–2.CrossRefGoogle Scholar
23Martinez-Gonzalez, MA, Garcia-Arellano, A, Toledo, E, Salas-Salvado, J, Buil-Cosiales, P, Corella, D, et al. A 14-item mediterranean diet assessment tool and obesity indexes among high-risk subjects: the PREDIMED trial. PLoS ONE 2012; 7: e43134.CrossRefGoogle ScholarPubMed
24Zazpe, I, Sanchez-Tainta, A, Estruch, R, Lamuela-Raventos, RM, Schroder, H, Salas-Salvado, J, et al. A large randomized individual and group intervention conducted by registered dietitians increased adherence to Mediterranean-type diets: the PREDIMED study. J Am Diet Assoc 2008; 108: 1134–44.CrossRefGoogle ScholarPubMed
25Mathuranath, PS, Nestor, PJ, Berrios, GE, Rakowicz, W, Hodges, JR. A brief cognitive test battery to differentiate Alzheimer's disease and frontotemporal dementia. Neurology 2000; 55: 1613–20.CrossRefGoogle ScholarPubMed
26Braun, V, Clarke, V. Using thematic analysis in psychology. Qual Res Psychol 2006; 3: 77101.CrossRefGoogle Scholar
27Raffaele, B, Matarese, M, Alvaro, R, De Marinis, MG. Health-promotion theories in nutritional interventions for community-dwelling older adults: a systematic review. Ann Ist Super Sanita 2017; 53: 146–51.Google ScholarPubMed
28Pender, NJ, Barkauskas, VH, Hayman, L, Rice, VH, Anderson, ET. Health promotion and disease prevention: toward excellence in nursing practice and education. Nurs Outlook 1992; 40: 106–12; 20.Google ScholarPubMed
29Perez-Lopez, FR, Chedraui, P, Haya, J, Cuadros, JL. Effects of the Mediterranean diet on longevity and age-related morbid conditions. Maturitas 2009; 64: 6779.CrossRefGoogle ScholarPubMed
30Ojagbemi, A, Akin-Ojagbemi, N. Exercise and quality of life in dementia. J Appl Gerontol 2017; doi: 10.1177/0733464817693374.Google ScholarPubMed
31Inouye, K, Pedrazzani, ES, Pavarini, SC, Toyoda, CY. Perceived quality of life of elderly patients with dementia and family caregivers: evaluation and correlation. Rev Lat Am Enfermagem 2009; 17: 187–93.CrossRefGoogle ScholarPubMed
32Farina, N, Page, TE, Daley, S, Brown, A, Bowling, A, Basset, T, et al. Factors associated with the quality of life of family carers of people with dementia: a systematic review. Alzheimers Dement 2017; 13: 572–81.CrossRefGoogle ScholarPubMed
33Moyle, W, Murfield, JE, Griffiths, SG, Venturato, L. Assessing quality of life of older people with dementia: a comparison of quantitative self-report and proxy accounts. J Adv Nurs 2012; 68: 2237–46.CrossRefGoogle ScholarPubMed
34Cooper, C, Ketley, D, Livingston, G. Systematic review and meta-analysis to estimate potential recruitment to dementia intervention studies. Int J Geriatr Psychiatry 2014; 29: 515–25.CrossRefGoogle ScholarPubMed
35Singh, B, Parsaik, AK, Mielke, MM, Erwin, PJ, Knopman, DS, Petersen, RC, et al. Association of Mediterranean diet with mild cognitive impairment and Alzheimer's disease: a systematic review and meta-analysis. J Alzheimers Dis 2014; 39: 271–82.CrossRefGoogle ScholarPubMed
Figure 0

Table 1 Scores for study outcomes

Figure 1

Table 2 Summary of qualitative framework analysis resultsa with example quotes

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