Uploaded June 2026 | Updated September 2026, 1 hour ago
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/ @theclsexperience
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What if the key to your energy, your mood, and your mental clarity was never in your medicine cabinet, but living inside your gut right now?
Dr. Will Bulsiewicz is a board-certified gastroenterologist, New York Times bestselling author of Fiber Fueled, and one of the most respected voices in gut health science. In this conversation, he completely reframes how we think about health from the inside out.
We go deep into the 38 trillion microorganisms living inside your body and why they are the command center for everything from digestion and immunity to mood, metabolism, and brain function. Dr. B opens up about his own health crisis, how he was 50 pounds overweight and depressed despite being a celebrated doctor, and how transforming his diet changed everything.
He breaks down why 95% of Americans are deficient in fiber, the one nutrient your gut microbes need most, and what happens when you start feeding them the right way. He walks through the science of short-chain fatty acids, why they are the most anti-inflammatory compounds he has found in over 20 years of medicine, and how your body produces its own natural GLP-1 when your gut is healthy.
He also drops a truth bomb about alcohol that made me rethink my entire relationship with it. This is real science made practical by a doctor who has lived the transformation himself. If you have ever felt like something is off with your health and you cannot figure out what it is, this conversation might hold the answer.
Key takeaways:
• Why 38 trillion non-human organisms control your digestion, mood, immunity, and brain
• How 95% of Americans are fiber deficient and what that is actually doing to your body
• The truth about short-chain fatty acids and why they are the most powerful anti-inflammatory tool in medicine
• Why Dr. B was 50 pounds overweight despite being a top doctor and what one change fixed everything
• How 95% of your serotonin is produced in your gut, not your brain
• What the science says about alcohol and gut barrier damage
• Why your morning coffee might be the most powerful gut health beverage you are already drinking
Listen now, and start building the kind of health foundation that no supplement or prescription can replace. Max out.
TIMESTAMPS
0:00 Introduction
02:09 How Important It Is to Be Connected to Your Mission
03:31 Spirituality and Finding Your Purpose
06:35 What Is the Gut Microbiome and Why It Matters
10:03 How Your Microbes Adapt to Your Lifestyle
13:21 The Bacteria That Helps Marathon Runners Perform
16:48 Why 95% of Americans Are Fiber Deficient
20:21 The Epidemic of Sadness and What We Can Do
21:24 Lifestyle Medicine and What the System Gets Wrong
25:04 Short-Chain Fatty Acids and Why They Change Everything
29:45 Reversing IBS and Healing Leaky Gut
33:44 Dr. B's Health Crisis and 50-Pound Transformation
41:34 What He Is Most Pumped About Right Now
45:52 The Truth About Carbs and Artificial Sweeteners
52:28 What Alcohol Really Does to Your Gut
55:48 What Your Poop Says About Your Health
58:53 Why Drinking Water Matters for Your Microbiome
59:30 The Best Source of Protein
1:04:06 Rucking and the Power of Walking With Weight
1:07:28 Morning Ritual and the Science of Sunlight
ABOUT CRAIG SIEGEL
Former Wall Street executive turned consciousness coach and author of The Reinvention Formula. Craig helps high-achieving professionals break free from empty success and build purpose-driven, soul-aligned businesses. His "Playing Small Is Canceled" movement has impacted thousands worldwide.
FREE TRAINING: The RISE Reinvention Formula → cultivatelastingsymphony.com
BOOK A CLARITY CALL → cultivatelastingsymphony.com
👇 SUBSCRIBE TO THE CHANNEL 👇
/ @theclsexperience
▶︎ WEBSITE | cultivatelastingsymphony.com
▶︎ INSTAGRAM | / craigsiegel_cls
#CraigSiegel #DrWillBulsiewicz #GutHealth #Microbiome #FiberFueled #TheCLSExperience #LifestyleMedicine #Mindset #PersonalDevelopment #ShortChainFattyAcids #InnerWork #SelfImprovement #Serotonin #PlantBased #Wellness #Health #Nutrition #AntiInflammatory #HealYourGut #SpiritualHealth
For speaking inquiries, partnerships, or press: team@cultivatelastingsymphony.com
© CLS 2026 | All Rights Reserved
👇 SUBSCRIBE TO THE CHANNEL so this show can reach more people 👇
/ @theclsexperience
Click the link below to join the CLS community (all value, no fluff) → cultivatelastingsymphony.com
What if the key to your energy, your mood, and your mental clarity was never in your medicine cabinet, but living inside your gut right now?
Dr. Will Bulsiewicz is a board-certified gastroenterologist, New York Times bestselling author of Fiber Fueled, and one of the most respected voices in gut health science. In this conversation, he completely reframes how we think about health from the inside out.
We go deep into the 38 trillion microorganisms living inside your body and why they are the command center for everything from digestion and immunity to mood, metabolism, and brain function. Dr. B opens up about his own health crisis, how he was 50 pounds overweight and depressed despite being a celebrated doctor, and how transforming his diet changed everything.
He breaks down why 95% of Americans are deficient in fiber, the one nutrient your gut microbes need most, and what happens when you start feeding them the right way. He walks through the science of short-chain fatty acids, why they are the most anti-inflammatory compounds he has found in over 20 years of medicine, and how your body produces its own natural GLP-1 when your gut is healthy.
He also drops a truth bomb about alcohol that made me rethink my entire relationship with it. This is real science made practical by a doctor who has lived the transformation himself. If you have ever felt like something is off with your health and you cannot figure out what it is, this conversation might hold the answer.
Key takeaways:
• Why 38 trillion non-human organisms control your digestion, mood, immunity, and brain
• How 95% of Americans are fiber deficient and what that is actually doing to your body
• The truth about short-chain fatty acids and why they are the most powerful anti-inflammatory tool in medicine
• Why Dr. B was 50 pounds overweight despite being a top doctor and what one change fixed everything
• How 95% of your serotonin is produced in your gut, not your brain
• What the science says about alcohol and gut barrier damage
• Why your morning coffee might be the most powerful gut health beverage you are already drinking
Listen now, and start building the kind of health foundation that no supplement or prescription can replace. Max out.
TIMESTAMPS
0:00 Introduction
02:09 How Important It Is to Be Connected to Your Mission
03:31 Spirituality and Finding Your Purpose
06:35 What Is the Gut Microbiome and Why It Matters
10:03 How Your Microbes Adapt to Your Lifestyle
13:21 The Bacteria That Helps Marathon Runners Perform
16:48 Why 95% of Americans Are Fiber Deficient
20:21 The Epidemic of Sadness and What We Can Do
21:24 Lifestyle Medicine and What the System Gets Wrong
25:04 Short-Chain Fatty Acids and Why They Change Everything
29:45 Reversing IBS and Healing Leaky Gut
33:44 Dr. B's Health Crisis and 50-Pound Transformation
41:34 What He Is Most Pumped About Right Now
45:52 The Truth About Carbs and Artificial Sweeteners
52:28 What Alcohol Really Does to Your Gut
55:48 What Your Poop Says About Your Health
58:53 Why Drinking Water Matters for Your Microbiome
59:30 The Best Source of Protein
1:04:06 Rucking and the Power of Walking With Weight
1:07:28 Morning Ritual and the Science of Sunlight
ABOUT CRAIG SIEGEL
Former Wall Street executive turned consciousness coach and author of The Reinvention Formula. Craig helps high-achieving professionals break free from empty success and build purpose-driven, soul-aligned businesses. His "Playing Small Is Canceled" movement has impacted thousands worldwide.
FREE TRAINING: The RISE Reinvention Formula → cultivatelastingsymphony.com
BOOK A CLARITY CALL → cultivatelastingsymphony.com
👇 SUBSCRIBE TO THE CHANNEL 👇
/ @theclsexperience
▶︎ WEBSITE | cultivatelastingsymphony.com
▶︎ INSTAGRAM | / craigsiegel_cls
#CraigSiegel #DrWillBulsiewicz #GutHealth #Microbiome #FiberFueled #TheCLSExperience #LifestyleMedicine #Mindset #PersonalDevelopment #ShortChainFattyAcids #InnerWork #SelfImprovement #Serotonin #PlantBased #Wellness #Health #Nutrition #AntiInflammatory #HealYourGut #SpiritualHealth
For speaking inquiries, partnerships, or press: team@cultivatelastingsymphony.com
© CLS 2026 | All Rights Reserved
