#102 Why Vitamin D Deficiency Accelerates Brain Aging

Rhonda Patrick

May 21, 2025

Episode description

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Vitamin D is far more than just a vitamin—it's a potent steroid hormone regulating nearly 5% of our genome. Yet, remarkably, up to 70% of Americans aren't getting enough, placing them at increased risk for dementia and Alzheimer's disease. In this episode, I explore compelling new evidence from a study involving over 12,000 participants, demonstrating that vitamin D supplementation can reduce dementia risk by an impressive 40%, protecting even adults with genetic Alzheimer's risk (ApoE4 carriers).

Timestamps:

(00:00) Can vitamin D supplements reduce dementia risk?
(00:46) How common is vitamin D deficiency?
(03:31) What studies reveal about genes, vitamin D, and dementia
(05:44) Does deficiency accelerate brain aging?
(06:45) Can vitamin D supplementation enhance cognitive function?
(08:15) Dementia risk reduction insights from 12,388 adults
(09:58) Why women may benefit most
(10:49) Normal vs. impaired cognition—who benefits more from vitamin D?
(11:21) Do ApoE4 carriers get dementia protection from vitamin D?
(13:00) How mild cognitive impairment affects dementia risk
(13:41) Does the form of vitamin D matter?
(14:11) What are the optimal vitamin D blood levels?
(15:07) What dose corrects deficiency?
(15:33) How vitamin D directly supports brain function

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Show notes are available by clicking here

The study discussed: Vitamin D supplementation and incident dementia: Effects of sex, APOE, and baseline cognitive status

Mindsip insights from this episode:

Boost brain health by enhancing amyloid beta clearance with vitamin D

One way vitamin D supports brain health is by enhancing the removal of amyloid beta, a protein linked to Alzheimer's disease, from the brain.

#Alzheimer's

#vitamin-D

Boost Vitamin D levels as aging reduces production

A 70-year-old person makes four times less Vitamin D from sun exposure than a 20-year-old.

#aging

#vitamin-D

Recognize vitamin D as a steroid hormone for genomic regulation

Vitamin D is not just a vitamin but a steroid hormone that gets converted to regulate nearly 5% of the protein-encoding human genome.

#hormones

#vitamin-D

Check vitamin D levels to ensure optimal health

The target range for 25-hydroxy vitamin D blood levels is between 30 to 60 nanograms per milliliter, which can be checked with a simple blood test.

#blood-test

#vitamin-D

Supplement with vitamin D to reduce dementia risk from mild cognitive impairment

Having mild cognitive impairment can increase dementia risk by over 600% in those not supplementing with vitamin D.

#dementia

#vitamin-D

Supplement vitamin D to reduce dementia risk for ApoE4 carriers

For people with the ApoE4 gene, a major genetic risk factor for Alzheimer's, vitamin D supplementation reduced dementia incidence by around 33%.

#APOE4

#vitamin-D

Prioritize vitamin D supplementation to reduce dementia risk in women

Women who supplemented with vitamin D experienced an almost 50% lower incidence of dementia, a significantly greater benefit compared to men.

#dementia

#vitamin-D

Address low vitamin D levels to reduce dementia risk

Studies using genetic analysis show that genetically determined low vitamin D levels can increase dementia risk by up to 54%, strengthening the causal link.