A large U.S. study found no overall link between total ultra-processed food intake and colorectal cancer. The result does not make every packaged food healthy; it suggests that the type of food may matter more than one broad processing label.
What changed
Researchers followed 461,682 adults who were ages 50–71 at enrollment. During nearly 19 years of median follow-up, 10,075 developed colorectal adenocarcinoma. The highest versus lowest fifth of ultra-processed food intake showed no meaningful difference in incidence (hazard ratio 0.97; 95% confidence interval 0.91–1.03). Whole-grain, fiber, dairy, and calcium sources were linked to lower incidence, while processed meat was linked to higher incidence. The paper was published October 15, 2026, and reported by PLOS on October 21.
How strong is the evidence?
This was a very large prospective cohort with long follow-up, but it was observational. It can identify associations, not prove that a food caused or prevented cancer. The National Cancer Institute funded the work; the authors declared no competing interests.
What remains uncertain
Participants reported diet once in 1995–1996, before many current products existed. Most were older and white, and diet changes during follow-up were not measured.
Why it matters
The findings favor looking past the front-of-package label. Whole grains and fiber remain useful choices, while processed meat still deserves caution. This does not overturn evidence that diets high in added sugar, sodium, saturated fat, and refined grains can be unhealthy.
Related: A controlled meal study found a larger insulin response after an ultra-processed meal.
Sources
Original peer-reviewed study in PLOS Medicine; PLOS research report.
Illustrative stock photograph by Wesual Click on Unsplash; the image does not depict study participants or results.
