The GutFit Nutrition Podcast

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


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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  • (04:20) — Study limitations: no control group, not peer-reviewed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


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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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The GutFit Nutrition PodcastBy Leigh Merotto, Dietitian | IBS, Gut Health and Fitness Expert

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