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Vitamin D & Alzheimer's — The Midlife Connection Brain & Longevity Report Health Science · Neurology · Prevention April 2026 Neuroscience & Prevention The Vitamin You Need in Your 30s to Protect Your Brain Decades Later Groundbreaking research links vitamin D levels in midlife to the toxic tau protein tangles at the heart of Alzheimer's disease — and the window of opportunity may be earlier than anyone thought. Research Report  ·  Published April 2026  ·  Based on peer-reviewed findings in Neurology Open Access A new landmark study has drawn one of the most compelling connections yet between a common nutrient deficiency and the earliest biological seeds of Alzheimer's disease. Researchers have found that people who had higher levels of vitamin D circulating in their blood during early middle age — around age 39 on average — went on to show significantly lower accumulations of tau protein in their brains roughly ...