MIND and Mediterranean Diets and Dementia: What the Research Says

You may have read that a “brain-healthy” diet can keep Alzheimer’s away. The real picture is more modest. Some eating patterns are linked with lower risk in studies that follow people over time, but the best trial so far did not find a clear benefit. This page explains both, then turns to what usually matters most for someone already living with dementia: eating and drinking enough, and enjoying it.

This is general information, not medical advice. Talk with a doctor or registered dietitian before changing your diet or someone else’s. See our medical disclaimer.

What are the Mediterranean and MIND diets?

The National Institute on Aging (NIA) describes them this way (NIA on diet and Alzheimer’s):

• Mediterranean diet: plenty of fruit, vegetables, whole grains, beans, fish and seafood, and olive oil, with low amounts of red meat, eggs and sweets.
• MIND diet (Mediterranean–DASH Intervention for Neurodegenerative Delay): a mix of the Mediterranean diet and the DASH diet for blood pressure. It features vegetables, especially green leafy ones; berries; whole grains; beans; nuts; fish at least once a week; and olive oil. It limits red meat, sweets, cheese, butter or margarine, and fried or fast food.

Do these diets lower dementia risk?

The evidence is mixed. The NIA says some, but not all, observational studies have linked the Mediterranean and MIND diets with lower dementia risk compared with a Western-style diet higher in red meat, saturated fat and sugar.

The 2024 Lancet Commission reviewed the research in more detail (Lancet Commission):

• One review of cohort studies linked high diet quality with about a 20% lower risk of dementia.
• A larger analysis of three cohorts linked closer adherence to the MIND diet with lower risk.
• But a Swedish study that followed 28,025 middle-aged people for about 20 years found no lower risk with either recommended diets or a Mediterranean-style diet.

Observational studies cannot prove cause and effect. People who eat this way often differ in other ways too, such as income, education, exercise and access to health care. The Commission concluded that there is not enough evidence to say healthy diets directly prevent dementia, though eating plenty of fruit and vegetables and fewer ultra-processed foods is good for many health conditions and affects risk factors such as obesity, diabetes and high blood pressure. It did not add diet to its list of 14 risk factors.

What did the 2023 MIND diet trial find?

The strongest test so far was a randomized trial published in the New England Journal of Medicine in 2023 (MIND diet trial):

• Who: 604 adults aged 65 and older in the Chicago and Boston areas, without thinking problems, who had a close relative with dementia, were overweight, and had a less healthy diet to begin with.
• What: for three years, half followed the MIND diet and half followed their usual diet. Both groups were asked to eat about 250 fewer calories a day and got regular coaching from registered dietitians.
• Result: thinking test results improved slightly in both groups. The difference between the groups was small and not statistically significant. Brain scans also showed similar changes in both groups.
• Weight: both groups lost about 5 kilograms (around 11 pounds).

Why might the trial have found no difference?

The researchers suggested several reasons. The control group probably improved its diet too, since it lost a similar amount of weight. Repeated testing can improve results on its own, as people get used to the tests. Three years may be too short. Most participants were well-educated and of European descent, so the results may not apply to everyone.

So the honest summary is: the MIND diet did not beat a sensible calorie-reduced diet over three years. That does not mean healthy eating is pointless. It means no one should expect a specific diet to prevent dementia.

What about specific foods and supplements?

The NIA says there is no evidence that eating or avoiding a specific food can prevent Alzheimer’s or age-related cognitive decline. Blueberries, leafy greens and turmeric have all been studied, without proof. The NIA also says no vitamin or supplement has been proven to prevent Alzheimer’s, and none is recommended for that purpose. The NIA warns that unproven products sold to prevent Alzheimer’s might be unsafe, a waste of money, or both, and could interfere with prescribed medicines, so check with a doctor before trying any (NIA on preventing Alzheimer’s).

How can eating stay healthy and enjoyable?

For most older adults, the aim is food that is nourishing, familiar and pleasant, not a strict plan:

• Build meals around foods you like from the Mediterranean pattern: vegetables, fruit, beans, whole grains, fish and olive oil.
• Keep favorite treats. Enjoyment and appetite matter, especially later in life.
• Eat with others when you can. Shared meals are good company.
• Cook together. Washing vegetables or stirring a pot is a good shared activity; see household tasks. A favorite family recipe can also spark reminiscence.

Older adults should not cut calories or lose weight without talking to a doctor, and fasting carries extra risks. See our fasting guide.

How can you help someone with dementia eat well?

For people living with dementia, eating and drinking enough is usually the main concern. The Alzheimer’s Association notes that people may forget to eat, think they have already eaten, or feel overwhelmed by choices, and that poor nutrition may increase behavioral symptoms and cause weight loss (Alzheimer’s Association on food and eating). These ideas come from the Alzheimer’s Association, the NIA and the Alzheimer’s Society:

1. Offer finger foods. Bite-sized pieces that are easy to pick up, such as sandwich pieces, chicken pieces, fish sticks, orange segments or steamed broccoli, let a person feed themselves without cutlery.
2. Use contrast on the table. Changes in vision can make it hard to tell food from plate. White plates or bowls on a contrasting place mat can help. Avoid patterned dishes and tablecloths.
3. Serve one or two foods at a time. A full plate can be overwhelming.
4. Keep mealtimes calm. Turn off the TV, keep the table simple, and allow plenty of time. The NIA suggests not rushing or pushing.
5. Offer small meals and snacks often. The NIA suggests smaller, more frequent meals and calorie-rich snacks if the person is not eating enough (NIA tips for eating well).
6. Help with drinking. Offer small cups of water or other drinks through the day, plus foods with lots of water such as fruit, soup, milkshakes and smoothies. If the person does not want water, the NIA suggests trying juice, flavored water, broth, milk, or decaf coffee or tea.
7. Check temperature. A person may not notice that food or a drink is too hot.
8. Adapt utensils and cups. Bowls instead of plates, spoons with large handles, and cups with lids can make eating easier. Do not worry about neatness.
9. Make food easier to chew and swallow. Cut food into small pieces or offer soft foods. If the person coughs or chokes when eating, tell their doctor.
10. Avoid force-feeding. The NIA notes that appetite naturally declines in the late stages of Alzheimer’s.

Signs to tell the doctor about

Weight loss, refusing food, tiredness or weakness can be signs that someone is not eating enough. The Alzheimer’s Society notes that sore teeth or dentures, depression, constipation and medicine changes can all reduce appetite (Alzheimer’s Society on appetite). Signs of dehydration listed by the NIA include dry mouth, dizziness, a rapid heart rate and hallucinations (NIA on common medical problems).

Talk with a doctor

Before making big changes to your own diet, or anyone else’s, talk with a doctor or registered dietitian, especially if you have diabetes, kidney disease, swallowing problems or recent weight loss. For someone living with dementia, ask how much they should aim to eat and drink each day, and whether a dietitian or supplements might help.

Get urgent help if someone is choking, or has sudden confusion, severe dizziness or fainting.