Monthly Archives: April 2026

A new study finds that a plant-based diet can reduce dementia risk, but not all plant-based foods rank equal when it comes to supporting cognitive health.

The study, which was published in the journal Neurology, captured the diets of over 90,000 individuals with an average age of 59. The study included a mix of ethnicities. In a follow-up a decade later, about half of those individuals provided an update on their current diet. Researchers categorized diets into quality tiers, with diets heavy in animal fats assigned the lowest-quality tier, unhealthy processed plant-based foods like french fries and fruit juice were assigned the mid-quality tier, and whole grains, nuts, fruits and vegetables were assigned the highest-quality tier. The study was most interested in the two plant-based diet tiers and its impact, if any, on dementia risk.

What the research discovered when isolating by the highest-quality diet tier, those who ate the most healthy plant-based foods had a 7 percent lower risk of dementia than those who ate the lowest amount. So quantity does matter when it comes to a plant-based diet.

But so does quality. When reviewing data for the group that ate the greatest amount of unhealthy plant-based options, their risk of developing dementia increased 6 percent.

I have to be on a gluten-free diet and I’ve found in the last two decades, the amount of gluten-free foods readily available has exploded. But that doesn’t mean those foods are necessarily healthy. I can easily find gluten-free pizza, donuts, cookies, and sugar-laden cereal. But on the flip side, I can make a conscious effort to find healthy gluten-free food, rich in whole grains and fiber. The same thing applies to vegan and plant-based diets. We live in an age of modern convenience which can lead to us consuming overprocessed comfort foods that may technically be plant-based but are anything but healthy.

A similar recommendation applies to animal fats, as there are healthier fats and benefits from eating fish and nuts versus eating a diet heavy in red meat or unhealthy processed foods like fried chicken. I was thinking of my father this past week as April 10 marked his birthday. He battled high cholesterol beginning in middle age, but he always was a fan of fish and my mother attempted to cook comfort foods with less-processed ingredients. One thing my dad was not fond of: raw vegetables. He said crunching into them hurt his teeth. I never saw my dad eat a salad; cole slaw was the closest he ever got. In spite of his aversion to vegetables, my father always stayed trim throughout his life, due to his love of walking.

Another interesting takeaway from the new study was that making dietary changes even at an older age can still benefit cognitive health. “We found that adopting a plant-based diet, even starting at an older age, and refraining from low-quality plant-based diets were associated with a lower risk of Alzheimer’s and other dementias,” said study lead author Song-Yi Park.