Eat less; move more; live longer is still the mantra here. We want to live as long as possible and also have a fully functioning brain all the way. I consider exercise to be one of the keys, but certainly diet plays a part, too.
Tufts Food & Nutrition Letter says that the science of whether some dietary choices can be considered brain food or not continues to unfold.

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Given long time-frames of conditions such as Alzheimer’s disease and other dementias, it’s challenging to prove any cause and effect relationship between specific foods and brain health. Most such associations are drawn from observational studies, in which people who eat more or less of a certain food are assessed over time for cognitive changes.
It’s obviously difficult to feed a group of study participants lots of, say, blueberries for several years in order to test their brain health at the end; that’s why clinical trials of so-called brain foods have largely depended on animal tests.
Nonetheless, some foods tend to stand out from the pages and pages of research results as most likely being protective for brain health.
Foods That Promote Brain Function
Brain foods typically contain one or more nutrients that scientists believe have positive effects on the brain and/or the cardiovascular system, which in turn affects the brain. These foods include: Continue reading