Today, I’m joined by Dr. William Davis, a cardiologist-turned-gut detective and bestselling author behind Wheat Belly, Super Gut, and Super Body. In this episode, Dr. Davis breaks down what it really means to have youthful, functional muscle, why maintaining the muscle of your 20s and 30s is about so much more than hitting the gym, and how missing microbes—like L. reuteri—might be the secret to restoring your strength and energy.Previous Episodes: #330: Lose the Bloat, Fix Your GUT: Inside the Microbiome Revolution (Skin, Weight & Longevity Secrets) with Dr William DavisEpisode Timestamps:Welcome, host and episode introduction ... 00:00:00What is youthful, functional muscle? ... 00:04:40Antibiotics, gut microbes, and aging ... 00:07:14Microbiome’s link to inflammation and mood ... 00:09:31How gut dysfunction drives disease ... 00:11:07Conventional medicine’s blind spot and SIBO ... 00:15:26Testing for SIBO and its prevalence ... 00:21:49“Microbe-driven” muscle & SIBO yogurt fermentation ... 00:24:17Why fermented foods and keystone microbes matter ... 00:28:11GLP-1 obesity drugs: risks and rebound ... 00:31:17Extreme dieting and lasting metabolic effects ... 00:37:04From cardiology to gut health: Dr. Davis’s journey ... 00:40:30DIY approaches for restoring health ... 00:45:05Modern diet pitfalls vs. ancestral eating ... 00:46:42L. reuteri, oxytocin, and muscle growth ... 00:53:00How to start and troubleshoot SIBO yogurt ... 01:01:39Practical 30-day protocol for vitality ... 01:09:22Episode wrap-up and thanks ... 01:18:42Our Amazing Sponsors:Vampire Exosome by Young Goose - A next-generation serum packed with three trillion PRP-derived exosomes and RejuvNAD to support collagen production and skin renewal at the cellular level—helping results build over time instead of fading fast. CLICK HERE and use code NAT10.Apollo Neuro — A wearable nervous system support device that uses personalized SmartVibes technology to help you feel calmer, more focused, and better able to shift into rest mode without adding another complicated wellness routine. Head to apolloneuro.com/nat and use code NAT for $99 off and 1 year Smart Vibes Ai.MitoPure Gummies by Timeline: These clinically researched gummies support mitophagy to help renew your mitochondria and boost cellular energy, giving you a stronger biological foundation for resilience—visit timeline.com/nat20 to get 20% off.Nat's Links:YouTube ChannelJoin My Membership CommunitySign up for My NewsletterInstagramDr. Bill Lawrence Episode