Could sunshine help protect your brain from dementia?

追加: 2026-05-28

[00:00:00]A new study says a key vitamin provided by the sun could play a big role in long-term brain health. Vitamin D levels have had some association with how rapidly people progress with dementia.

[00:00:12]The study followed 800 people over 16 years, and it determined that those with higher vitamin D levels in their 30s and 40s had less tau buildup on the brain later in life. Tau protein is a key marker linked to dementia. These are abnormal clumps of protein that are not naturally situated in these neurons and gum up the works and allow the neurons to malfunction, and eventually they're toxic, and they cause neurons to drop out and die. The accumulation of enough cell death then results in the malfunction of the brain.

[00:00:45]The study's author commented that these results suggest that higher vitamin D levels in midlife may offer protection against developing these tau deposits in the brain, and that low vitamin D levels could potentially be a risk factor that could be modified and treated to reduce the risk of dementia.

[00:01:07]If you're treating when you're already beginning to develop the symptoms and express the the symptoms around dementia, which is, you know, memory and judgment and behavior, the horse is out of out of the barn. It's far too late.

[00:01:18]So, the idea is to move upstream and look at lifestyle factors, not immediately, but decades before. While the report gives some positive advice for dementia prevention, it does not provide proof that vitamin D will directly prevent the disease. The cause and effect is a little bit difficult.

[00:01:38]Now, especially when you're dealing with a a process that evolves over decades, it's very difficult to tease exactly why vitamin D association is there. A routine blood test will determine your vitamin D levels, and if your levels are low, your doctor may recommend supplements, some diet changes, or sunlight exposure.