会不会因为出汗太多？ The three patients should have been portraits of health. They were young, lean and physically active. Unusually active, in fact: Two regularly ran 100-mile ultramarathons, and one had completed 13 half-marathons in a single year. By the time they came to see Dr. Timothy Cannon, all three had advanced colon cancer. He was mystified; the oldest of them was 40, and none had any known risk factors. The doctor couldn’t help wondering if extreme running might have played a role. So Dr. Cannon, an oncologist with Inova Schar Cancer in Fairfax, Va., launched a study, recruiting 100 marathon and ultramarathon runners aged 35 to 50 to undergo a colonoscopy. The results were staggering. Almost half the participants had polyps, and 15 percent had advanced adenomas likely to become cancerous. The rate of advanced adenomas was much higher than that seen among adults in their late 40s in the general population, which ranges from 4.5 percent to 6 percent, according to recent studies The figure among extreme runners was even higher than the 12 percent rate among Alaska Natives, who are unusually prone to colon cancer. The research was presented at an American Society of Clinical Oncology conference but has not yet been published in a medical journal. “I was surprised — you would think running is super healthy,” said Laura Linville, 47, of Alexandria, Va., a longtime marathon runner who participated in the study. She learned she had seven polyps, including some so large that she had to undergo additional procedures. “Running is typically associated with better body mass and lower stress and lots of other positives — you never hear it’s bad for you,” said Ms. Linville, who took up ultramarathon running for a while during the pandemic. She has no intention of giving up marathons but will get checked often for signs of colon cancer, she said. The new study comes amid heightened concerns about a rise in colon and rectal cancer rates among adults under 50, a population that historically has had a low risk of cancer. Older adults still make up the vast majority of those diagnosed with colon cancer. But the increase in so-called early-onset colorectal cancer led in 2021 to a change in screening recommendations. The age for a first colonoscopy was lowered to 45, from 50, for those at average risk. The rise in colorectal cancer among younger adults has mystified experts. Physical inactivity and rising rates of obesity are frequently blamed — one reason his very fit, lean patients struck Dr. Cannon as worth investigating. “You never want to give people an excuse not to exercise, because by and large, we have bigger problems from people not exercising enough,” said Dr. Cannon (who ran the New York City Marathon himself in 2010). “But I do believe, after what I’ve seen from my patients and what we’ve found here, that extreme exercise may increase the risk of this cancer.” 原文：https://www.nytimes.com/2025/08/19/health/running-colon-cancer.html
会不会因为出汗太多？
The three patients should have been portraits of health. They were young, lean and physically active. Unusually active, in fact: Two regularly ran 100-mile ultramarathons, and one had completed 13 half-marathons in a single year. By the time they came to see Dr. Timothy Cannon, all three had advanced colon cancer. He was mystified; the oldest of them was 40, and none had any known risk factors. The doctor couldn’t help wondering if extreme running might have played a role. So Dr. Cannon, an oncologist with Inova Schar Cancer in Fairfax, Va., launched a study, recruiting 100 marathon and ultramarathon runners aged 35 to 50 to undergo a colonoscopy. The results were staggering. Almost half the participants had polyps, and 15 percent had advanced adenomas likely to become cancerous. The rate of advanced adenomas was much higher than that seen among adults in their late 40s in the general population, which ranges from 4.5 percent to 6 percent, according to recent studies The figure among extreme runners was even higher than the 12 percent rate among Alaska Natives, who are unusually prone to colon cancer. The research was presented at an American Society of Clinical Oncology conference but has not yet been published in a medical journal. “I was surprised — you would think running is super healthy,” said Laura Linville, 47, of Alexandria, Va., a longtime marathon runner who participated in the study. She learned she had seven polyps, including some so large that she had to undergo additional procedures. “Running is typically associated with better body mass and lower stress and lots of other positives — you never hear it’s bad for you,” said Ms. Linville, who took up ultramarathon running for a while during the pandemic. She has no intention of giving up marathons but will get checked often for signs of colon cancer, she said. The new study comes amid heightened concerns about a rise in colon and rectal cancer rates among adults under 50, a population that historically has had a low risk of cancer. Older adults still make up the vast majority of those diagnosed with colon cancer. But the increase in so-called early-onset colorectal cancer led in 2021 to a change in screening recommendations. The age for a first colonoscopy was lowered to 45, from 50, for those at average risk. The rise in colorectal cancer among younger adults has mystified experts. Physical inactivity and rising rates of obesity are frequently blamed — one reason his very fit, lean patients struck Dr. Cannon as worth investigating. “You never want to give people an excuse not to exercise, because by and large, we have bigger problems from people not exercising enough,” said Dr. Cannon (who ran the New York City Marathon himself in 2010). “But I do believe, after what I’ve seen from my patients and what we’ve found here, that extreme exercise may increase the risk of this cancer.”
原文：https://www.nytimes.com/2025/08/19/health/running-colon-cancer.html
二者说不定有联系，但因果关系科不一定是这篇文章说的这样哦。。。。
我也认识一个喜欢跑马拉松的，肺癌过世，当时刚四十二岁。
中国那位全程马拉松吸着烟跑的大神。 也没得肺癌呀
至少这个不是一个普遍的训练方法，我认识的跑团里的人，没听说过谁为了模拟撞墙而专门饿肚子跑。反而是为了完成hard work，推崇提前补碳。
吓人啊