Episode #755: The Secret Brain Defenders That Protect Against Dementia & Alzheimer’s with Dr David Perlmutter

What if protecting your memory starts with understanding your brain’s own immune system?

In this episode, Neurologist Dr. David Perlmutter and I explore microglia—the immune cells that can help nurture the brain but may become damaging when chronic inflammation and metabolic dysfunction take over.  Get Dr Perlmutter’s new book, Brain Defenders: Harness the Power of Your Immune Cells to Safeguard Your Brain’s Destiny.  

Your Brain Has Its Own Defense System

Microglia help support synapses, encourage the growth of new brain cells, and maintain the blood-brain barrier.

But Dr. Perlmutter explains that changes in inflammation and metabolism can shift these cells away from their protective role, offering a different way to think about what may be happening upstream of cognitive decline.

Your Metabolism and Your Brain Are Connected

One of the episode’s biggest take aways is that “microglial metabolism mirrors your body’s metabolism.”

Blood sugar, insulin sensitivity, gut health, diet, and inflammation may therefore have consequences that reach all the way to the brain.

The conversation reveals why protecting cognitive health may need to begin decades before memory problems become noticeable.

The Everyday Choices That Could Protect Your Brain

Exercise, better sleep, colorful fiber-rich foods, metabolic health, and other daily habits take on new significance when viewed through the lens of microglia.

Dr. Perlmutter explains why the goal isn’t simply to live longer with a healthy brain—it’s to recognize how much influence your everyday choices may have over your cognitive future.

Listen to the full episode to discover what these “brain defenders” are doing behind the scenes and the practical strategies Dr. Perlmutter believes can help keep them working in your favor.

• • 00:00 Amyloid Myth Busted
  • 00:15 Show Intro and Guest
  • 04:18 Book Inspiration Microglia
  • 06:02 Symptom Care vs Root Cause
  • 09:51 Microglia M1 vs M2
  • 11:15 Gut Brain Inflammation Link
  • 15:01 Metabolism Mirrors Microglia
  • 17:57 Infections Vaccines and Triggers
  • 19:31 CTE Diabetes and Feedforward
  • 25:20 New Tools and Beta Amyloid Drugs
  • 30:37 Cochrane Verdict Drugs Fail
  • 33:28 Lifestyle Trial Reverses Decline
  • 38:23 Microglia Lifestyle Levers
  • 39:07 Exercise Myokines Brain Boost
  • 42:20 Alzheimers Risk Epigenetics
  • 45:12 Imaging Microglia TSPO
  • 46:24 Fasting Ketones Brain Fuel
  • 49:45 MCT Oil Memory Care
  • 51:16 POINTER Lifestyle Trial
  • 55:57 Fiber Polyphenols Foods
  • 58:34 Supplements DHA Vitamin D
  • 01:02:23 Key Labs Glucose Tau
  • 01:06:19 Prevention Mission Wrap
  • 01:07:43 Final Thanks Outro

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