Nutrition and brain health

An older couple in their seventies preparing vegetables together in a sunlit kitchen

Navigating your nourishment

The World Health Organization (WHO) 2026 dementia guidelines recommend adopting a healthy diet as part of reducing dementia risk.

They are noticeably more specific about what they do not recommend.

Let's explore what this means.

What WHO does not recommend

This exploration is what most brain-health content leaves out.

WHO does not recommend vitamin B or vitamin E supplementation, omega-3 polyunsaturated fatty acids or multivitamin and mineral supplements for reducing dementia risk in people without a diagnosed deficiency.

That is a noteworthy gap between their guidance and much of what is sold and written about this subject. In other words, if you take a supplement specifically to protect your memory and you have no diagnosed deficiency, current guidance does not support it. Do not change anything you take without speaking to your doctor, however, who may have prescribed it for an unrelated reason.

In full transparency, we have written about omega-3's and are reviewing our article against these guidelines as we continue to learn more.

A Black woman in her fifties swapping the salt for a jar of herbs while cooking

A Latina woman in her seventies pouring olive oil over a salad in a wooden bowl

What the evidence supports

The overall pattern of your diet matters more than any single nutrient.

The recommendation focuses on your overall eating pattern and closely aligns with advice for heart health. WHO also recommends managing cardiometabolic conditions such as diabetes and high cholesterol, which is another way of addressing many of the same risk factors.

What is a healthy diet pattern?

Almost every diet studied for cognitive benefit shares the same core, no matter what it is called.

Vegetables, particularly leafy green ones, most days
Whole grains rather than refined
Fish, beans and nuts rather than red and processed meat
Olive oil as the main fat
Limited added sugar and limited alcohol

The MIND and Mediterranean diet patterns are two versions of this idea. You can find many online recipes and cookbooks by searching with these names. However, the name matters less than the overall pattern. In other words, you don’t need to follow a branded diet to eat this way.

An Asian man in his fifties adding berries and walnuts to oatmeal at breakfast

A Black woman in her fifties and her mother in her late seventies chopping side by side at the same board

Why supplements are recommended anyway

The gap between evidence and marketing is unusually wide here, and it's worth understanding why.

Observational studies often find that people with higher intake of a nutrient have better outcomes. When those nutrients are then given as supplements in controlled trials, the benefit generally does not appear. The most likely explanation is, for example, eating fish is a marker for a whole pattern of living while a swallowing capsules is not.

Supplements are also regulated far more loosely than medicines, which means the incentive to publicize a promising observational finding is large and the obligation to confirm it is small.

None of this means a supplement is harmful. It means that if you are taking one to protect your memory, the current evidence does not support that specific purpose.

Two family members of different generations walking along the

Give yourself a baseline

Dietary changes take time, and their effects are rarely obvious day to day.

A repeatable baseline, taken annually, gives you something concrete to compare over time.

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