57: The Brain’s Immune System: How Metabolism Shapes Cognitive Health with Dr. David Perlmutter

In this episode of Take Back Your Health®, I sit down with neurologist and author Dr. David Perlmutter to explore a question that changes how we think about cognitive health: what if the brain’s future is shaped not only by genetics or age, but by the metabolic and immune signals we influence every day?

Dr. Perlmutter joins me to discuss his newest book, Brain Defenders, and the brain’s immune cells, known as microglia. We unpack how blood sugar, inflammation, sleep, exercise, diet, metabolic health, hormones, and other lifestyle inputs may influence whether these cells support the brain or contribute to a more destructive inflammatory state.

This conversation is especially important if you are thinking about cognitive health before symptoms appear. We discuss why brain-health conversations may need to begin decades before a diagnosis, how perimenopausal hormone changes intersect with microglia, why APOE4 is a risk factor rather than a predetermined outcome, and what Dr. Perlmutter wants listeners to understand about taking action now.

What You'll Learn

The Missing Piece: Immunometabolism and Microglia
Blood Sugar, Inflammation, and the Tests That May Reveal Risk
Why Brain Health May Begin Before Symptoms
Diet, Exercise, Sleep, and the Power of Consistency
Genetics, Emerging Therapies, and the Brain-Health Spectrum

About Dr. David Perlmutter

Dr. David Perlmutter is a board-certified neurologist and author whose work focuses on brain health, nutrition, metabolic health, and neurodegenerative disorders. His official website identifies Brain Defenders as his most recent book and describes it as a work centered on the brain’s immune cells and their relationship to long-term brain health.

Resources

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Timestamps

00:00 — Welcome and Dr. Perlmutter’s return to the podcast
01:03 — From mainstream neurology to root-cause exploration
03:30 — Leaving conventional practice and building an integrative neurology clinic
04:49 — Grain Brain and lifestyle’s influence on brain health
05:53 — Metabolism, inflammation, and the brain’s immune system
08:04 — Immunometabolism as the missing piece
10:50 — Lifestyle choices, genetics, and brain health
12:14 — What microglia are and their M2 versus M1 states
14:50 — TSPO imaging and surrogate markers of microglial activation
17:18 — P-tau217, fasting insulin, homocysteine, and A1C
18:00 — When brain-health prevention should begin
20:43 — Early-life sugar exposure, the microbiome, and immune regulation
23:11 — Why humans seek sweet foods and how fructose affects metabolism
25:10 — Diet, blood-sugar monitoring, CGMs, fiber, and healthy fats
27:59 — Perimenopause, estrogen, microglia, and brain changes
31:02 — Metabolic health before menopause
36:18 — Lifestyle intervention, exercise, stress management, and cognition
38:39 — Alzheimer’s medications, benefit-risk questions, and prevention
41:45 — Alzheimer’s as a spectrum and the discussion of plasma exchange
44:11 — Epigenetic-age interventions and the role of exercise
46:21 — Hyperbaric oxygen, mitochondria, blood flow, and brain health
48:48 — Glycation, blood sugar, and shifting microglia toward support
50:17 — Testing, lifestyle changes, and the brain-health spectrum
51:45 — Modifiable risk factors, genetics, and APOE4
55:59 — Dr. Perlmutter’s three ways to take back your brain
56:58 — Brain Defenders, official website, and where to find Dr. Perlmutter
57:42 — Closing thanks

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