Rhonda Patrick· PhD
Vitamin D deficient individuals experienced cognitive decline 2-3 times faster than those with adequate vitamin D.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Vitamin D deficient individuals experienced cognitive decline 2-3 times faster than those with adequate vitamin D.
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An analysis of over 2,600 adults aged 50+ found that vitamin D deficiency (30 nmol/L or less) had a steeper drop in global cognition & executive function vs. vitamin D sufficiency (> 75 nmol/L) over 6 yrs follow-up.