Short answer: Preliminary. In a Chicago cohort of 923 older adults, moderate MIND adherence was linked to a 35 percent lower rate of Alzheimer’s. But the first large trial (Barnes 2023, 604 people, three years) found no difference in cognition or brain MRI versus a control diet. It remains a healthy pattern: lean on leafy greens, berries, nuts, beans and olive oil.
The MIND diet has not been shown to protect cognition in a trial. Observational studies link it to lower Alzheimer’s risk and slower decline, but the one large randomized trial was null, so the evidence is preliminary.
MIND stands for Mediterranean-DASH Intervention for Neurodegenerative Delay. Martha Clare Morris and colleagues at Rush University built it in 2015 from the parts of the Mediterranean and DASH diets most linked to brain health in earlier studies.
What to eat on the MIND diet
The diet lists 10 food groups to eat and five to limit.
| Eat | MIND target |
|---|---|
| Green leafy vegetables | at least 6 servings per week |
| Other vegetables | at least 1 serving per day |
| Berries | at least 2 servings per week |
| Nuts | at least 5 servings per week |
| Olive oil | main cooking fat |
| Whole grains | at least 3 servings per day |
| Fish | at least 1 serving per week |
| Beans and legumes | at least 3 servings per week |
| Poultry | at least 2 servings per week |
| Wine | no more than 1 glass per day (see below) |
| Limit | MIND target |
|---|---|
| Red meat | fewer than 4 servings per week |
| Butter and margarine | less than 1 tablespoon per day |
| Cheese | less than 1 serving per week |
| Pastries and sweets | fewer than 5 servings per week |
| Fried and fast food | fewer than 1 serving per week |
Compared with the Mediterranean diet, MIND puts more weight on leafy greens and berries, asks for less fish and spells out what to limit. The cheese limit is stricter than most people expect.
Leafy greens are rich in folate, lutein, vitamin K and beta-carotene, all linked to slower cognitive decline in observational studies. Berries are rich in anthocyanins and other flavonoids. In the Nurses’ Health Study of 16,010 women aged 70 and over, those who ate more blueberries and strawberries had slower cognitive decline (Devore 2012). The authors estimated the gap as equal to up to 2.5 years of cognitive aging. That is an observational finding.
Wine. The original diet included up to a glass a day, based on observational links between light drinking and lower dementia risk. Genetic studies have since questioned whether any amount of alcohol protects the brain, and many researchers now consider this part outdated. If you don’t drink, don’t start.
Making it work day to day
- Greens first: A large lunch salad or a side of sautéed spinach most days gets you to six servings a week.
- Berries: Keep frozen blueberries and strawberries for oatmeal, yogurt or snacks. They are cheaper than fresh and available all year.
- Cooking fat: Switching from butter to extra-virgin olive oil meets two targets at once.
- Nuts: A small daily handful of almonds, walnuts or pecans meets the target.
- Fish and beans: Plan one or two fish meals a week (canned counts) and use lentils, chickpeas or black beans as a protein several times a week.
- Calories still count: MIND says what to eat, not how much. Eating too much, even of nuts and olive oil, can lead to obesity, which is itself a risk factor for cognitive decline.
- Whole foods, not pills: A berry extract or a fish oil pill isn’t the same as eating berries and fish. The evidence is built on whole foods, and supplements are not a substitute for the diet itself.
You don’t need to be perfect. The limits are thresholds, not bans, and the original study linked moderate adherence to lower risk.
Diet also doesn’t work alone. Exercise, sleep, social contact, mental activity and stress all affect brain health too.
The original 2015 study
Morris and colleagues used the Rush Memory and Aging Project, which follows older adults in the Chicago area. They followed 923 people aged 58 to 98 for an average of 4.5 years, recorded their diet with food questionnaires, and tracked new cases of Alzheimer’s (Morris 2015). Each person got a score for the MIND, Mediterranean and DASH diets, split into low, moderate and high adherence.
Compared with low adherence:
- High MIND adherence was linked to a 53 percent lower rate of Alzheimer’s.
- High Mediterranean adherence was linked to a 54 percent lower rate, and high DASH adherence to a 39 percent lower rate.
- Moderate MIND adherence was linked to a 35 percent lower rate. Moderate adherence to the other two diets showed no clear link.
That last result made MIND look forgiving: you might not need to follow it perfectly. But this was an observational study with self-reported diets, so other differences between people could explain the results.
Other cohorts in the US and Australia have also linked higher MIND adherence with slower cognitive decline and lower Alzheimer’s risk. These include a second Morris 2015 paper, Hosking 2019 in Australia, and the studies in the van den Brink 2019 review. These studies can’t show the diet caused the difference.
What the 2023 MIND trial found
The real test came in a randomized trial published in the New England Journal of Medicine (Barnes 2023). It enrolled 604 older adults without cognitive impairment who had a family history of dementia, a less-than-ideal diet and a BMI over 25. Half were assigned the MIND diet with mild calorie restriction. The other half kept their usual diet, also with mild calorie restriction. Both groups got counseling and weight-loss support for three years. Cognition was measured with a set of 12 tests.
There was no clear difference in the change in overall cognition between the groups (0.035 standardized units, P = 0.23). Cognitive scores rose slightly in both groups. MRI measures of white-matter damage, hippocampal volume and total brain volume also changed similarly in both.
Several things may have made a difference harder to detect:
- The control group got counseling too. Its cognition also improved, which may have narrowed the gap.
- Three years may be too short. The cohort studies with the strongest findings followed people for 4.5 to 10 years.
- Participants started out cognitively normal. Slowing a decline that hasn’t started yet is hard to measure, and the trial may not have had enough power for it.
The trial doesn’t prove the diet is useless for the brain, and it doesn’t rule out a longer-term benefit. But it is the best test so far, and it gives no positive evidence that MIND protects cognition.
MIND diet vs Mediterranean diet
The evidence doesn’t clearly favor one over the other. At high adherence, the two diets were linked to almost identical drops in Alzheimer’s risk in the original study (53 percent vs 54 percent). MIND only stood out at moderate adherence.
A later study looked at the brains of 581 people from the Rush cohort after death (Agarwal 2023). Higher MIND and Mediterranean scores were both linked to less Alzheimer’s pathology, mainly less beta-amyloid, with no clear link to tau tangles. This goes beyond test scores, but it is still observational.
The Mediterranean diet has some positive trial evidence on cognition from PREDIMED sub-studies, though with limits. In one, people on a Mediterranean diet with extra nuts did better on a memory composite than a low-fat control group (Valls-Pedret 2015). Overall, the Mediterranean diet has the deeper evidence base.
In practice the two diets overlap heavily. A Mediterranean diet with more leafy greens and berries is close to MIND. For other variants, see our pages on the green-Mediterranean diet and the DASH diet.
Frequently asked questions
Can the MIND diet reverse cognitive decline?
There is no strong evidence that any diet can reverse established cognitive impairment or dementia. The MIND research is about slowing decline and lowering risk in people who are cognitively normal or in the very earliest stages. A better diet still supports heart and metabolic health at any age.
How soon would I notice a difference?
Probably not soon. Any benefit for the brain would build over years. Some people feel more energetic within weeks of eating better, but that is likely from more vegetables and less processed food in general, not the MIND pattern specifically.
Should I follow it if I carry the APOE4 gene variant?
APOE4 carriers have a much higher risk of Alzheimer’s. Some analyses of the MIND data looked at APOE4 status, with mixed results, and there is no specific evidence that the diet works differently in carriers. The diet is a reasonable part of a wider plan that includes exercise, sleep and managing heart risk. Discuss your risk and any monitoring with your doctor.
Sources
Morris, M. C., Tangney, C. C., Wang, Y., Sacks, F. M., Bennett, D. A., & Aggarwal, N. T. (2015). MIND diet associated with reduced incidence of Alzheimer’s disease. Alzheimer’s & Dementia, 11(9), 1007–1014. doi:10.1016/j.jalz.2014.11.009
Morris, M. C., Tangney, C. C., Wang, Y., Sacks, F. M., Barnes, L. L., Bennett, D. A., & Aggarwal, N. T. (2015). MIND diet slows cognitive decline with aging. Alzheimer’s & Dementia, 11(9), 1015–1022. doi:10.1016/j.jalz.2015.04.011
Barnes, L. L., Dhana, K., Liu, X., Carey, V. J., Ventrelle, J., Johnson, K., … & Sacks, F. M. (2023). Trial of the MIND diet for prevention of cognitive decline in older persons. New England Journal of Medicine, 389(7), 602–611. doi:10.1056/NEJMoa2302368
Agarwal, P., Leurgans, S. E., Agrawal, S., Aggarwal, N. T., Cherian, L. J., James, B. D., … & Schneider, J. A. (2023). Association of Mediterranean-DASH Intervention for Neurodegenerative Delay and Mediterranean diets with Alzheimer disease pathology. Neurology, 100(22), e2259–e2268. doi:10.1212/WNL.0000000000207176
Devore, E. E., Kang, J. H., Breteler, M. M. B., & Grodstein, F. (2012). Dietary intakes of berries and flavonoids in relation to cognitive decline. Annals of Neurology, 72(1), 135–143. doi:10.1002/ana.23594
Valls-Pedret, C., Sala-Vila, A., Serra-Mir, M., Corella, D., de la Torre, R., Martinez-Gonzalez, M. A., … & Ros, E. (2015). Mediterranean diet and age-related cognitive decline: a randomized clinical trial. JAMA Internal Medicine, 175(7), 1094–1103. doi:10.1001/jamainternmed.2015.1668
van den Brink, A. C., Brouwer-Brolsma, E. M., Berendsen, A. A. M., & van de Rest, O. (2019). The Mediterranean, Dietary Approaches to Stop Hypertension (DASH), and Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) diets are associated with less cognitive decline and a lower risk of Alzheimer’s disease — a review. Advances in Nutrition, 10(6), 1040–1065. doi:10.1093/advances/nmz054
Hosking, D. E., Eramudugolla, R., Cherbuin, N., & Anstey, K. J. (2019). MIND not Mediterranean diet related to 12-year incidence of cognitive impairment in an Australian longitudinal cohort study. Alzheimer’s & Dementia, 15(4), 581–589. doi:10.1016/j.jalz.2018.12.011