Health
Marathon Running Linked to Colon Cancer Risk
Health Points
- Distance runners showed a higher rate of colon cancer precursors than the average adult.
- Experts believe intense endurance activities may stress the gut, but more research is needed.
- Staying active is important—just keep up with regular colon cancer screenings.
A recent study found that 15% of serious distance runners, compared to only 5% of typical adults, had early signs that could develop into colon cancer.
Researchers examined 100 athletes who had completed multiple marathons or ultramarathons, discovering a notably higher presence of risky colon polyps than is usually seen in people of similar age groups.
Dr. Timothy Cannon, who co-led the study, noted, “It’s a risk to run extreme distances, even marathons.”
Yet, experts emphasize not to stop running based on these results alone, as exercise has proven health benefits.
Dr. Christina Dieli-Conwright added, “I would hate to deter people from running, or starting to run or even jog, as a result of this study.”
The study suggests that rigorous exercise might divert blood flow from the digestive system, potentially affecting gut health and raising questions about long-term impacts, though proof is lacking.
Researchers stress that much more evidence is needed, especially regarding recreational runners, before any conclusions are drawn.
Even the study’s authors say they have no plans to give up distance running themselves, underlining that the general lack of physical activity is a bigger health concern.
Anyone logging high mileage should continue exercising but remain attentive to recommended colon cancer screenings and symptoms that deserve medical attention.
“The problem is that athletes look so healthy that people presume that there’s no way they could have any risk of cancer,” explained Dr. Cathy Eng.
If you’re passionate about running, keep moving—just remember routine checkups help keep you healthy for the long run.
