Fact-Check: Do These Everyday Habits Really Raise Colon Cancer Risk?

In brief

A widely shared EatingWell article, "Colon Cancer Risk May Be Increased by These Common Activities," lists five everyday habits it says can raise colon cancer risk: sitting for long stretches, eating too little fiber, drinking alcohol, smoking, and putting off screening. We read the article and checked each claim against the National Cancer Institute (NCI), the U.S. Food and Drug Administration (FDA), the American Cancer Society (ACS), and the 2025 U.S. Surgeon General's advisory on alcohol.

Verdict: the article is largely accurate and matches authoritative guidance. Its core message—that colorectal cancer often has no early symptoms, that regular screening matters, and that a handful of routine habits are tied to risk—is well supported. Two claims deserve a little more context, which we explain below. As always, this is general education, not medical advice, and no lifestyle change removes risk entirely.

The numbers behind the headline

The article says colorectal cancer is expected to affect "nearly 159,000 people in the U.S. in 2026," with rates rising in people younger than 65. That checks out. ACS estimates about 108,860 new colon cancers and 49,990 new rectal cancers in the United States in 2026—roughly 158,850 combined—along with about 55,230 deaths. ACS also reports that incidence has been rising by about 2.9% per year in adults under 50 and about 0.4% per year in adults ages 50 to 64, even as it falls in older adults. So the "under 65 and rising" framing is fair.

Claim 1: Sitting too much raises risk — supported

The article says a pattern of prolonged sitting and low activity, over time, is the concern—not an occasional lazy day. NCI states plainly that "a lifestyle that includes regular physical activity is linked to a decreased risk of colorectal cancer," and that obesity is linked to a higher risk of colorectal cancer and of death from it. The article's activity target—150 to 300 minutes of moderate activity, or 75 to 150 minutes of vigorous activity, each week—matches the American Cancer Society's physical activity recommendation for adults. Verdict: accurate.

Claim 2: Too little fiber raises risk — mostly supported, with a caveat

This is the one claim worth reading carefully. The article cites a review linking higher fiber intake to lower colorectal cancer risk, and fiber has clear benefits for digestion. But NCI's prevention summary is more cautious on cancer specifically: it says "it is not known" whether a diet low in fat and meat and high in fiber, fruits, and vegetables lowers colorectal cancer risk, noting that studies have been mixed. In short, fiber is a healthy, sensible thing to eat more of, and ACS includes high-fiber foods like whole grains, beans, fruits, and vegetables in its cancer-prevention eating pattern—but the evidence that fiber by itself prevents colon cancer is less settled than a single line might suggest. Verdict: directionally reasonable; the cancer-prevention link is not as certain as the article implies.

Claim 3: Regular alcohol raises risk — supported

The article explains that when the body breaks down alcohol it produces acetaldehyde, a compound that can damage DNA, and that even moderate and lighter drinkers carry higher risk. This aligns with the 2025 U.S. Surgeon General's advisory, which identifies colorectal cancer as one of at least seven cancers causally linked to alcohol and describes acetaldehyde and DNA damage among the mechanisms. NCI's summary notes that drinking three or more alcoholic drinks per day increases colorectal cancer risk; the Surgeon General's advisory adds that risk rises across drinking levels, not only at heavy use. The article's takeaway—that any reduction can help—is a fair reading. Verdict: accurate.

Claim 4: Smoking raises risk — supported

The article says tobacco smoke exposes the body to carcinogens that can damage DNA in the colon and contribute to precancerous polyps. NCI confirms that "cigarette smoking is linked to an increased risk of colorectal cancer and death from colorectal cancer." Verdict: accurate.

Claim 5: Delaying screening raises risk — supported, with useful nuance

The article's strongest and best-supported point is that screening can find early cancer and, during colonoscopy, remove polyps before they turn into cancer. It correctly states that ACS recommends adults at average risk begin regular screening at age 45 and continue through 75 if they are in good health with a life expectancy over 10 years. (ACS says the decision is individualized for ages 76 to 85, and screening is generally not recommended after 85.)

The article also notes that stool-based and blood-based tests are options, and that "some sort of screening is better than no screening." That is true, with one caveat worth knowing. The FDA did approve the first blood-based screening test (Guardant's Shield) in July 2024 for average-risk adults 45 and older—but the agency noted it detected only about 55% to 65% of stage I colorectal cancers and missed roughly 87% of precancerous growths, and a positive result still requires a follow-up colonoscopy. ACS lists blood tests as the least-preferred option for this reason. Verdict: accurate; blood tests are a real option but less sensitive than colonoscopy or stool DNA tests, especially for catching pre-cancer.

One more claim: limit red and processed meat — supported

Among its extra tips, the article advises limiting red and processed meats. This is well grounded. The World Health Organization's cancer agency (IARC) classifies processed meat as a Group 1 carcinogen—its evidence links processed meat to colorectal cancer—and red meat as Group 2A ("probably carcinogenic"). IARC estimated that each 50-gram daily portion of processed meat is associated with about an 18% higher colorectal cancer risk. ACS recommends limiting red and processed meats as part of a cancer-prevention diet. Verdict: accurate.

What this fact-check does not mean

• It does not mean these habits are the only causes of colon cancer, or that avoiding them guarantees you will never get it. Family history, inherited syndromes, inflammatory bowel disease, and age all matter, and some people with none of these risks still develop the disease.
• It does not mean anyone should start, stop, or change a medication, diet, or screening plan based on a news article. Those choices belong with your own clinician.
• It does not mean a blood test is a substitute for a colonoscopy for everyone. The right test depends on your risk level and history.
• It does not replace evaluation of symptoms. Blood in or on the stool, a lasting change in bowel habits, ongoing abdominal pain, or unexplained weight loss should be checked by a doctor at any age—even below the usual screening age.

Questions people can ask a healthcare team

• Based on my age, family history, and health, when should I start screening, and which test fits me best?
• Is a colonoscopy, a stool-based test, or a blood test the right choice for my situation?
• Which changes—more movement, less alcohol, quitting tobacco, more fiber—would matter most for me?
• I've noticed a change in my bowel habits (or bleeding). Should this be evaluated now rather than at my next routine screening?

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Sources

This article was prepared from the original EatingWell piece and the NCI, FDA, ACS, WHO/IARC, and U.S. Surgeon General sources linked above. They were checked on July 24, 2026.

How this article was prepared

Prepared by Cancer Explained's AI-assisted editorial system and checked against the official sources listed above. This article has not been reviewed by a healthcare professional unless a named reviewer is specifically shown.

Cancer Explained is a nonprofit-oriented public-interest education project. It is not a diagnostic service, does not recommend treatments, and is not for emergencies.

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