The Diary Of A CEO with Steven Bartlett
The Diary Of A CEO with Steven Bartlett

Most Replayed Moment: Are You Really Gluten Intolerant? It Could Be This Instead!

Your gut symptoms might not be caused by gluten. Dr Will Bulsiewicz is a leading gastroenterologist and gut health expert specialising in the microbiome, digestion and the science of food. In this moment, Dr Will Bulsiewicz reveals why bloating, gas and constipation are often misunderstood, and why

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Steven Bartlett Host

Topics Discussed

Episode Summary

Executive Summary: The discussion explains how bloating, gas, and irregular digestion often stem from constipation, motility issues, microbiome imbalance, and diet—not just “gluten.” It emphasizes that chronic symptoms signal an underlying problem, that incomplete evacuation can look like frequent pooping, and that many “gluten-sensitive” people may actually react to fructans or wheat processing factors like glyphosate. The episode also links gut health to immune development and inflammatory bowel disease risk.

Main Topics: When digestive symptoms signal a real problem (Priority: 5/5): The speaker distinguishes occasional bloating from persistent, chronic symptoms that suggest something is wrong and should be addressed with personalized care. Constipation as the leading cause of gas and bloating (Priority: 5/5): Constipation is framed as the most common driver of gas/bloating, including cases where people still poop daily but are not fully emptying their bowels. Motility, microbiome, and diet as causes of gas (Priority: 5/5): Gas and bloating are presented as multi-causal: intestinal motility, microbiome health, and dietary triggers such as dairy and wheat-related carbohydrates can all contribute. Gluten versus fructans and wheat intolerance (Priority: 5/5): The conversation argues that many people who believe they are gluten-intolerant may actually be reacting to fructans in wheat, barley, rye, garlic, and onions rather than gluten itself. Wheat processing and glyphosate concerns (Priority: 4/5): The episode raises the claim that U.S. wheat processing and glyphosate spraying may affect gut microbes, helping explain why some people tolerate wheat abroad better than in the U.S. Gut damage, dysbiosis, and inflammatory bowel disease (Priority: 5/5): The transcript explains dysbiosis as a damaged gut, discusses IBD as a severe inflammatory condition, and links immune confusion to microbiome rejection and early-life microbial development. Antibiotics and future gut disease risk (Priority: 4/5): Antibiotic use is described as a major disruptor of gut diversity and barrier function, with increased risk for inflammatory bowel disease afterward.

Key Arguments: Chronic bloating or digestive discomfort is not normal and should be treated as a sign of an underlying issue. Constipation is the most common cause of gas and bloating, and it can exist even when someone poops every day. Incomplete evacuation can produce multiple bowel movements a day while still leaving stool behind. Gas often tracks with stool movement; once a full morning bowel movement happens, gas production may decrease. The microbiome makes up a large share of stool and is central to digestion because humans lack the enzymes to break down fiber. When stool moves slowly, microbes have more time to ferment food and generate gas. Gas and bloating can also come from microbiome damage and from dietary ingredients such as lactose and fructans. Many people who think they are gluten-sensitive may actually be reacting to fructans, not gluten. Fermenting dough into sourdough can reduce fructan content and improve tolerance for some people. Wheat differences between countries may involve glyphosate use in U.S. agriculture, which the speaker argues can disrupt the microbiome. Inflammatory bowel disease is shaped by genetics, but industrialization, antibiotics, and gut disruption can raise risk. The microbiome and immune system are educated together early in life, so early microbial development matters for later gut-immune health.

Data Points: Microbiome share of stool weight: 60% - Speaker claims most of stool weight is microbial rather than just leftover food Early-life microbiome development window: First 3 years of life - Microbiome is described as becoming essentially adult-sized by age three Antibiotics and IBD risk: Doubled - Taking antibiotics reportedly doubles the risk of inflammatory bowel disease in the next year Gut barrier disruption from antibiotics: 50% reduction - Speaker says antibiotics reduce gut barrier function by 50% during a course U.S. IBD increase: Up to 55% - Ulcerative colitis and Crohn’s cases reportedly increased in the U.S. from 1970 to 2010 Example of stool frequency: Every other day can be normal - Used to show that constipation is not defined solely by frequency Example of severe constipation: One week without pooping - Presented as unquestionably constipated Breakfast bar study design: 3 bars - Placebo bar, gluten bar, and fructan bar were given to participants Participant response in study: Gluten caused less symptoms than placebo - Used to argue that gluten was not the main trigger for self-reported gluten-sensitive participants

Pivotal Quotes: "If it's prolonged, if it's a chronic health issue, if you're the type of person who you wake up in the morning and you say, I hope today is going to be a good day. I hope I don't have to deal with that specific issue. You have a problem." — Speaker: Explaining that persistent digestive symptoms indicate an underlying issue "60% of the weight of your stool is microbial." — Speaker: Describing the microbiome’s major contribution to stool composition "It’s not a gluten intolerance, it’s a fructane intolerance." — Speaker: Summarizing the claim that many self-reported gluten reactions are actually due to fructans

Implications: Listeners are encouraged to look beyond generic gluten avoidance and assess constipation, motility, and microbiome health. For the industry, the episode supports more personalized gut care, careful food reintroduction, and attention to wheat processing, antibiotics, and early-life microbiome development.

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About The Diary Of A CEO with Steven Bartlett

Steven Bartlett is a British entrepreneur, investor, and author. He’s the founder of Flight Story – a media company – and Flight Fund, an investment fund backing the next generation of category-defining businesses. He created The Diary Of A CEO to share the unfiltered pages of the personal diaries of the world’s most fascinating CEOs, experts, therapists, and leaders – with the hope that their lessons will help both you and him live better lives. DOAC is a double acronym: Diary Of A CEO, but also Dreamers, Open-minded, Awareness, and Connection.This is your corner of the internet to dream boldly, think openly, expand your awareness, and feel more connected. My New Book: https://g2ul0.app.link/DOAC IG: https://www.instagram.com/steven LI: https://www.linkedin.com/in/stevenbartlett-123

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