Large U.S. study finds mixed cancer links among ultra-processed foods
A study following more than 460,000 U.S. adults for nearly two decades found no overall link between ultra-processed food intake and colorectal cancer incidence. The results varied by food type: processed meat was tied to more cases, while some ultra-processed whole grains and dairy products were tied to fewer. The authors say processing level alone may be too broad to capture health effects.
The study drew on 461,682 U.S. adults aged 50–71 at enrollment in 1995–1996 and tracked colorectal cancer diagnoses through 2018, with median follow-up of 18.8 years. Ultra-processed products supply more than half of U.S. adults’ calories, but the category spans very different foods.
No overall association appeared between total ultra-processed food intake and colorectal cancer. Whole-grain, fiber, dairy, and calcium sources from ultra-processed foods were linked to lower incidence, while ultra-processed meat was linked to higher incidence. Replacing 10% of ultra-processed intake by weight with minimally processed foods was associated with 2% lower incidence.
Consumers may find the findings useful because they suggest that “ultra-processed” is too broad a label for judging cancer risk. People who rely on packaged foods could be affected by clearer distinctions among products, especially whole-grain, dairy, and meat items. Food manufacturers and health communicators may face pressure to explain differences within the category. Still, the study is observational, so it cannot prove cause and effect, and individual dietary choices should be interpreted with that limitation in mind.