Your brain has its own immune system, and whether those immune cells protect your brain or attack it depends largely on your metabolic health, which you control with what you eat, how you move, how you sleep, and even the air you breathe.

Dr. David Perlmutter is a board-certified neurologist and six-time New York Times bestselling author of Grain Brain, Brain Maker, Drop Acid, and now Brain Defenders.

He explains how microglia, the brain's immune cells, shift from brain defenders to brain destroyers when your metabolism breaks down, and why that shift sits underneath Alzheimer's, Parkinson's, multiple sclerosis, and even depression. The conversation covers the diet pillars that keep blood sugar in check, why you need both cardio and strength training, how poor air quality and poor sleep feed inflammation, and the tests that show where you stand long before your memory slips.

He closes with his three strategies for wellness: have fun, stay socially connected, and take charge of your own health destiny.

Time Stamps:

05:47 How Brain Defenders ties together Grain Brain, Brain Maker, and Drop Acid

08:14 Immunometabolism: why metabolism affects every organ

10:08 The gut microbiome and the brain

11:12 How AI is connecting the dots across specialties

14:54 Microglia: the brain's own immune system

19:12 How metabolism flips microglia from defenders to destroyers

21:37 Type 2 diabetes, blood sugar, and choosing your diet

22:48 Fiber, polyphenols, protein, and dietary fat

25:56 The Mediterranean diet and the Ornish and Tanzi study

27:40 Cardio vs. strength training, myokines, and BDNF

30:50 Flexibility and balance training to avoid injury

32:21 Air quality, PM2.5, and air purifiers

34:23 Why sleep matters for your brain

40:34 Sleep latency and melatonin timing

42:11 Tests to track your metabolic and brain health

44:53 Vitamin D and K2

46:38 3 strategies to get and stay well

Links:

Dr. David Perlmutter: drperlmutter.com

Brain Defenders (book and ordering bonuses): braindefenders.com

40+ Fitness coaching (2 slots open, 16 weeks plus 2 freeze weeks): email coach@40plusfitness.com

The way to recover stronger from surgery is to build the foundation before you ever get to the operating room: go in with as much muscle as you can keep, feed the repair with protein, and get your sleep, stress, and inflammation under control, then layer on advanced tools only with a doctor's guidance.

Zora Benhamou is a gerontologist, healthy aging coach, and host of the Hack My Age podcast. After years of fighting osteoarthritis with injections, diet, and rehab, she had both hips replaced 12 weeks apart. She walks through how she kept her muscle with blood flow restriction bands, what she ate to rebuild bone around the implant, which peptides and other biohacks she tried, and why none of them matter without the basics.

She closes with her three strategies for aging well: nurture your network, learn to breathe through your nose, and understand your hormones.

Time Stamps:

05:05 From looking good to longevity: becoming a gerontologist

08:40 Osteoarthritis vs. osteoporosis and trying to avoid surgery

10:06 PRP, hyaluronic acid, and pentosan polysulfate

15:34 Two hip replacements, 12 weeks apart

18:00 Keeping muscle with KAATSU blood flow restriction bands

20:29 Protein, collagen, and bone-building nutrition for recovery

22:01 The anti-inflammatory diet

23:09 Sleep, stress, and hormones in recovery

26:25 Advanced recovery tools and the Wolverine stack peptides

31:57 Methylene blue

34:02 The biohacking pyramid: foundation first

36:31 Test one thing at a time

38:52 Wellness strategy 1: nurture your network

41:05 Wellness strategy 2: functional nose breathing

43:24 Wellness strategy 3: understand your hormones and protect your bones

Links:

Zora Benhamou: hackmyage.com (website, podcast, and all her social channels)

Hack My Age podcast: hackmyage.com

40+ Fitness coaching (3 slots open, 16 weeks plus 2 freeze weeks): email coach@40plusfitness.com

Better sleep after 40 comes from building the right daily rhythms, not from trying harder at bedtime. Mollie McGlocklin, creator of Sleep Is a Skill, makes the case that sleep is a learnable skill, and that forcing it or chasing a perfect score on your tracker usually makes it worse.

Mollie went through acute insomnia while traveling overseas and left doctor after doctor with sleeping pills and no real guidance. In this episode she explains what sleep latency and sleep efficiency tell you, why falling asleep the second your head hits the pillow can be a red flag, which tracker numbers you can trust (and why deep sleep and REM aren't among them), when a nap helps and when it hurts, what to do when good sleep habits aren't enough, and why sleep really begins in the morning.

Time Stamps:

03:42 Why you can't force sleep

05:07 Mollie's insomnia story

06:17 Sleeping pills and the case for CBT-I

09:07 Sleep as a skill, not a sleeper type

11:36 Sleep latency: when falling asleep fast is a red flag

13:18 Sleep efficiency and nighttime wakeups

14:51 Binaural beats, white noise, and sleep sounds

17:28 Sleep stages and why tracker data misleads

18:37 Blood oxygen averages and missed sleep apnea

20:12 Track trends in one device: HRV and heart rate

23:35 How wearables spotted COVID early

25:14 Why sleep apnea testing should be repeated

27:18 Naps and the insomnia exception

28:49 The caffeine nap

31:50 Shift workers and longer naps

33:37 When sleep hygiene isn't enough

35:15 CBT-I, ACT, and circadian entrainment

38:52 The health of your word

39:09 Sleep begins in the morning

40:48 Loneliness, relationships, and sleep

41:29 What hunter-gatherers teach us about sleep

Links:

Sleep Is a Skill (newsletter, podcast, and coaching): https://sleepisaskill.com

The Wellness Roadmap: https://amzn.to/3U1xEdn