Daily brief   for adults 50+ Subscribe AM & PM email
50 Plus HubEverything for Everyone 50+
Customize My age is in the: 50s 60s 70s 80+ Text size Language
‹ Back to Breaking News
health50+

Vitamin D Levels in Midlife Linked to Brain Health

Thursday, July 16, 2026 · 1 sources

A 16-year study of nearly 800 people found that higher vitamin D levels in midlife may be associated with better brain health later on. The study discovered a link between vitamin D levels and lower levels of tau protein, a marker for dementia.

Researchers followed nearly 800 people over 16 years to investigate the relationship between vitamin D levels in midlife and long-term brain health. The study found that individuals with higher vitamin D levels in their 30s and 40s had lower levels of tau protein later in life. Tau protein is a key marker linked to dementia. This suggests that vitamin D levels in midlife may play a significant role in shaping brain health decades later. The study's findings provide new insights into the potential importance of vitamin D for brain health. More research is needed to fully understand the relationship between vitamin D and dementia. The study's results are based on a long-term follow-up of a large group of people, providing valuable information on the potential long-term effects of vitamin D levels on brain health.

The 50+ takeaway: Higher vitamin D levels in midlife may support brain health.

Go Deeper

What is tau protein and how is it related to dementia?

Tau protein is a marker linked to dementia, and high levels of it in the brain are associated with an increased risk of developing the condition. The study found that people with higher vitamin D levels in midlife had lower levels of tau protein later on.

How long did the study follow the participants?

The study followed nearly 800 people over 16 years to investigate the relationship between vitamin D levels in midlife and long-term brain health.

What age group was studied?

The study looked at people in their 30s and 40s, investigating the relationship between their vitamin D levels during this period and their brain health later in life.

What are the implications of the study's findings?

The study's findings suggest that vitamin D levels in midlife may play a significant role in shaping brain health decades later, and that maintaining adequate vitamin D levels during this period may be important for reducing the risk of dementia.

Is more research needed on this topic?

Yes, more research is needed to fully understand the relationship between vitamin D and dementia, and to confirm the study's findings. Further studies can provide additional insights into the potential importance of vitamin D for brain health.