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A new study suggests a possible link between marathon running and colorectal cancer. Researchers found that endurance athletes had a significantly higher rate of advanced adenomas, precancerous polyps, than expected. While the study, presented at the American Society of Clinical Oncology, requires further confirmation, it highlights a potential risk for long-distance runners. The researchers speculate that restricted blood flow during intense runs may cause chronic inflammation, increasing cancer risk. However, the overall health benefits of exercise still outweigh the potential risks for most individuals.

Prepared by Olivia Bennett and reviewed by editorial team.