The Diary of a CEODr. Will Bulsiewicz: Why your gut runs your immune system
Through fiber and circadian habits that feed the gut microbiome; covers leaky gut, inflammation, and how the gut barrier rebuilds every five days.
At a glance
WHAT IT’S REALLY ABOUT
Healing Your Gut: Fiber, Fermented Foods, and Daily Rhythms Transform Health
- This episode with gastroenterologist Dr. Will Bulsiewicz explores how the gut microbiome drives inflammation, disease risk, and overall health, and how quickly it can be repaired with targeted lifestyle changes. He explains the science behind fecal transplants, leaky gut, and short-chain fatty acids, linking them to conditions from cancer and Parkinson’s to mood disorders and IBS. A large part of the discussion focuses on practical tools: fiber-rich and fermented foods, smart use of supplements, circadian-aligned routines, and why ultra-restrictive diet fads are harmful. The conversation ends on how emotional trauma, relationships, and forgiveness are intertwined with gut health and healing, both physically and psychologically.
IDEAS WORTH REMEMBERING
5 ideasFecal transplants reveal how decisive the microbiome is for health.
Transplanting stool from a healthy donor can rapidly reverse life-threatening C. diff infections and even improve cancer treatment and Parkinson’s symptoms, proving how restoring microbial balance can reset immune and inflammatory responses.
Most everyday gut symptoms are rooted in inflammation and dysbiosis, not just ‘sensitive stomachs.’
Bloating, gas, fatigue, brain fog, and mild aches often reflect chronic low-grade inflammation driven by a damaged gut barrier and disrupted microbiome, even in people who appear fit or lean.
Fiber and fermented foods are the two biggest missing pieces in modern diets.
Over 90% of people are fiber-deficient and rarely eat fermented foods, starving beneficial bacteria and reducing production of anti-inflammatory short-chain fatty acids that protect the gut barrier and immune system.
Not all ‘gluten problems’ are gluten—often they’re fructans and processing (like glyphosate).
Many people react more to fructans in wheat, barley, and rye or to processing chemicals such as glyphosate than to gluten itself, which is why sourdough or organic grains can be tolerated when standard bread or pasta are not.
Daily circadian habits powerfully shape gut health and inflammation.
Consistent wake/sleep times, morning light plus movement, early high-fiber meals, social lunches, post-meal walks, and limiting late-night eating or intense evening workouts all support digestion, hormone balance, and microbiome rhythm.
WORDS WORTH SAVING
5 quotes“60% of the weight of your stool is your microbiome.”
— Dr. Will Bulsiewicz
“We live in an industrial world where 95% of us are not getting even close to the amount of fiber that we need.”
— Dr. Will Bulsiewicz
“Loneliness will destroy your longevity faster than just about anything. It’s on par with smoking cigarettes.”
— Dr. Will Bulsiewicz
“Healing comes in many forms, and sometimes it’s the changes we make to our diet, and sometimes it’s the changes we make in our relationships.”
— Dr. Will Bulsiewicz
“Of all the things that I’ve studied, short-chain fatty acids are the most anti-inflammatory thing I’ve ever come across.”
— Dr. Will Bulsiewicz
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