From a Wall Street Journal online article:
Dementia is a complicated disease that has multiple causes and risk factors, some of which remain unknown. Nevertheless, there is increasing evidence that people—even those who inherit genes that put them at greater risk of developing Alzheimer’s in later life—can improve their chances by adopting lifestyle changes.
“It’s not just about running three times a week,” says Sarah Lenz Lock, executive director of AARP’s Global Council on Brain Health. “Instead, it’s about a package of behaviors, including aerobic exercise, strength training, a healthy diet, sleep and cognitive training.”
When it comes to battling dementia, the unfortunate news is this: Medications have proven ineffective at curing or stopping the disease and its most common form, Alzheimer’s disease. But that isn’t the end of the story. According to a recent wave of scientific studies, we have more control over our cognitive health than is commonly known. We just have to take certain steps—ideally, early and often—to live a healthier lifestyle.
In fact, according to a recent report commissioned by the Lancet, a medical journal, around 35% of dementia cases might be prevented if people do things including exercising and engaging in cognitively stimulating activities. “When people ask me how to prevent dementia, they often want a simple answer, such as vitamins, dietary supplements or the latest hyped idea,” says Eric Larson, a physician at Kaiser Permanente in Seattle and one of a group of scientists who helped prepare the report. “I tell them they can take many common-sense actions that promote health throughout life.”
To read more: https://www.wsj.com/articles/what-science-tells-us-about-preventing-dementia-11574004600
Notably 6 in 10 adults worldwide (59%) say they prefer to eat many small meals throughout the day, as opposed to a few larger ones, with younger consumers especially leaning into snacks over meals as that number rises to 7 in 10 among Millennials (70%).
In a 
In summary, dietary fructose, but not glucose, supplementation of HFD impairs mitochondrial size, function, and protein acetylation, resulting in decreased fatty acid oxidation and development of metabolic dysregulation.
Our findings suggest that higher adherence to a Mediterranean diet is associated with better cognitive performance, and therefore less cognitive decline, in older but not middle-aged individuals.
2 years of moderate calorie restriction significantly reduced multiple cardiometabolic risk factors in young, non-obese adults. These findings suggest the potential for a substantial advantage for cardiovascular health of practicing moderate calorie restriction in young and middle-aged healthy individuals, and they offer promise for pronounced long-term population health benefits.
“In the beginning, the company was so in rapture with health and wellness, that they’d get cashews from some exotic place and you’d end up spending 20-some dollars for a bag of nuts,” Widener says. “But I’d still buy a bag because I wanted to learn about it, and I felt better when I ate ‘em.” The supermarket-as-classroom ethos even influences Erewhon’s physical layout: the grocer builds shelves that are 
Breakfast
At the Charité University Hospital in Berlin, I’ve employed what’s called intermittent fasting, or time-restricted eating, to help patients with an array of chronic conditions. These include diabetes, high blood pressure, rheumatism and bowel diseases, as well as pain syndromes such as migraines and osteoarthritis.
Unlike carbohydrates or fats, proteins are the only nutrients that can be used to build new cells that can form tissue, said Dr. Walter, a registered dietitian. 
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