The food you eat could play an important role in your risk of develop Alzheimer’s, but pinpointing the best diet for Alzheimer’s prevention is tricky.
, many researchers posit that an anti-inflammatory diet might benefit the brain. In Scarmeas’ study, more than 1,000 older adults in Greece completed a food frequency questionnaire and earned a score based on how “inflammatory” their diet was. The lower the score, the better. For example, fatty fish, which is rich in omega-3 fatty acids, was considered an anti-inflammatory food and earned negative points. Cheese and many other dairy products, high in saturated fat, earned positive points.
To sort all this out, researchers rely on randomized controlled trials, the gold standard for providing proof of a causal effect. But in the arena of diet and dementia, these studies have challenges. Many researchers now suspect that intervening earlier will have a bigger impact. “We now know that the brain is stressed from midlife and there’s a tipping point at 65 when things go sour,” says Hussein Yassine, an Alzheimer’s researcher at the Keck School of Medicine of the University of Southern California in Los Angeles. But intervene too early, and a trial might not show any effect.
Imagine a trial designed to test whether the Mediterranean diet can help slow cognitive decline. The participants aren’t told which group they’re in, but the control group sees that they aren’t getting nuts or fish or olive oil. “What ends up happening is a lot of participants will start actively increasing the consumption of the Mediterranean diet despite being on the control arm, because that’s why they signed up,” Yassine says.
Plus there are the things researchers can’t control. For example, how does the food interact with an individual’s medications and microbiome? “We know all of those factors have an interplay,” Chin says. Kaeberlein studies aging, not dementia specifically, but he follows the research closely and acknowledges that the lack of clear answers can be frustrating. “I get the feeling of wanting to throw up your hands,” he says. But he points out that there may not be a single answer. Many diets can help people maintain a healthy weight and avoid diabetes, and thus reduce the risk of dementia. Beyond that obvious fact, he says, “it’s hard to get definitive answers.
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