A new study involving more than 6,200 U.S. adults aged 50 and older has identified five nutrients linked to a lower risk of dementia after seven years. Researchers measured how frequently participants consumed 163 foods and beverages over the previous year and then examined 101 dietary nutrients. Each participant took a cognitive test, and a close contact was asked about the person’s memory.
Protective nutrients
The study found that the following five nutrients were associated with reduced dementia risk:
Isorhamnetin, a plant flavonol with anti-inflammatory and neuroprotective effects. Some early research suggests it may help reduce the buildup of amyloid-beta, a protein tied to Alzheimer’s disease. Food sources include red onions, pears, apples with skin, berries, kale, and green tea.
Dietary fiber, which feeds gut bacteria and supports cognitive function. Nearly 95 percent of U.S. adults do not get enough fiber. It can be found in lentils, black beans, oats, chia seeds, apples, raspberries, broccoli, and whole grains.
Beta-tocopherol and beta-tocotrienol, two forms of vitamin E with antioxidant activity that protect against oxidative stress. Sources include sunflower seeds, hazelnuts, walnuts, wheat germ, and barley.
Manganese, a trace mineral essential for enzyme function and brain energy metabolism. It plays a role in neurotransmitter synthesis and may shield brain cells from oxidative damage. Good sources include pineapple, oats, pecans, brown rice, chickpeas, and spinach.
Foods linked to higher risk
The study also found that diets high in added sugars were tied to a higher dementia risk. Some dairy-derived nutrients, including lactose, were also associated with greater risk. The researchers cautioned that dairy foods also contain vitamin D and calcium, which are linked to healthy aging, so the overall effect of dairy may be mixed.
The findings reinforce that a whole-food diet rich in antioxidant fruits, vegetables, nuts, and seeds supports long-term brain health. While individual nutrients can be highlighted, the pattern of eating matters most.
