A large observational study of more than 460,000 older Americans found no overall link between ultra-processed food consumption and colorectal cancer incidence over nearly 19 years of follow-up. The results, published in PLOS Medicine, challenge the common assumption that all ultra-processed foods are equally risky for cancer.
The picture changes when individual food categories are examined. Higher consumption of ultra-processed whole grains, fiber, dairy, and calcium was associated with lower colorectal cancer incidence, while ultra-processed meat was linked to higher incidence. The authors suggest that nutritional content may matter more than the processing label itself.
The study has limitations: participants were mostly older white adults, diet was measured only once at the start, and the observational design cannot prove causation. Still, the findings align with existing dietary guidance to emphasize whole grains and dairy and limit processed meat.