22: Are Marathons Linked to Colon Cancer Risk? What Runners Need to Know episode artwork

EPISODE · Sep 12, 2025 · 15 MIN

22: Are Marathons Linked to Colon Cancer Risk? What Runners Need to Know

from The GutFit Nutrition Podcast · host Leigh Merotto, Dietitian | IBS, Gut Health and Fitness Expert

Do marathons cause colon cancer? There have been several posts circulating online alongside a New York Times article about a recent study about colon cancer in long distance runners. Let’s break down the study & what you need to know about distance running and colon cancer risk! ⏱️ Chapters: (00:00) — Grab the Gut-Friendly Sports Drink Guide!(00:38) — Welcome to the Gut Fit Nutrition Podcast(01:27) — Today’s topic: Colon cancer study in long-distance runners(03:00) — Study overview & sensational media headlines(04:20) — Study limitations: no control group, not peer-reviewed(06:00) — Possible mechanisms: blood flow, oxygen, runner’s colitis(07:20) — Missing variables: hydration, NSAIDs, nutrition, body composition(08:20) — Ultra-endurance considerations and lifestyle factors(09:00) — Broader evidence: physical activity reduces colon cancer risk(10:20) — Known risk factors: diet, lifestyle, genetics, IBD(11:30) — Emerging theory: microplastics and colorectal cancer(12:50) — Practical takeaways: study quality, balanced perspective(14:10) — Closing thoughts—🎁 ⁠⁠⁠⁠⁠⁠Grab FREE Gut Friendly Sports Drink Guide ⁠—👩🏻‍💻 RESOURCES & LINKS MENTIONED: ⤵️📌 Study referenced 📌 PMID: 26500336📌 PMID: 35612669📌 PMID: 29325535—✉️ CONNECT WITH ME: ⤵️📱⁠⁠⁠⁠Follow on Instagram⁠⁠⁠🖥️ ⁠⁠ Shop the Resource Suite⁠⁠⁠👩🏻‍⚕️ ⁠⁠⁠Apply For Coaching⁠⁠⁠If the GutFit Nutrition Podcast is giving you value - helped your digestion and fitness, made you rethink how you approach your gut health, please consider leaving a review! 🎧 If you have questions for my listener Q & A episodes, you can submit them here, or send me an email at ⁠[email protected]⁠. See you soon!

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22: Are Marathons Linked to Colon Cancer Risk? What Runners Need to Know

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