1 year ago

Low Carb Diets Like Keto May Be Fueling the Rise in Colon Cancer

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Nicholas Vincent is a passionate environmentalist and freelance writer. He is deeply committed to promoting... Read More

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A new study suggests that low-carb diets like keto—often praised for quick weight loss—may come with a dangerous downside: an increased risk of colon cancer, especially in younger people. Canadian researchers have found that slashing carbs can trigger harmful activity in naturally occurring gut bacteria.

The study, led by Professor Alberto Martin from the University of Toronto, focused on how diet can influence the gut microbiome’s role in cancer development. Mice fed low-carb diets and infected with a specific strain of E. coli—called NC101—produced a toxin named colibactin. This toxin damages DNA in colon cells, causing precancerous polyps. Worryingly, this strain is found in around 60% of human colorectal cancer cases.

Even more concerning, the low-carb mice showed a thinning of the colon’s protective mucus layer. This barrier helps shield colon cells from harmful bacteria. A weakened barrier may allow more toxins to penetrate, increasing cancer risk.

Colon cancer rates have surged among people under 50 in the U.S., with diagnoses expected to nearly double by 2030. Meanwhile, low-carb diets like keto have grown in popularity, with over 23 million Americans now following them.

Though the study was conducted on mice and further research is needed, scientists noted that high-fiber foods—like garlic, onions, and leeks—help promote beneficial gut bacteria and reduce cancer risk. Fiber also improves digestion and protects the colon lining.

This research doesn’t mean all carbs are good, especially refined sugars, but it does highlight the protective role of plant-based, fiber-rich foods.

Let this be your sign to rethink your plate. Load up on plants, legumes, and whole foods. Reducing meat and processed foods not only supports your gut but also helps protect animals and the planet. Your dinner choices matter—choose compassion, choose fiber.

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