Ultraprocessed Food Consumption and Risk of Early-Onset Colorectal Cancer Precursors Among Women

November 2025 

A new study published in JAMA Oncology found that women who eat more ultraprocessed foods (UPFs) such as packaged snacks, sugary drinks, and processed meats may have a higher risk of developing early precancerous growths in the colon. 

The study followed over 29,000 female nurses under age 50 for more than two decades. Researchers found that those with the highest UPF intake had a 45% higher chance of developing conventional adenomas, a type of colorectal polyp that can lead to cancer. No link was found for another type of polyp called serrated lesions. 

Experts say these findings suggest that cutting back on ultraprocessed foods and focusing on a balanced, whole-food diet may help reduce the risk of early-onset colorectal cancer. 

Source: Wang C, Du M, Kim H, et al. JAMA Oncology. Published online November 13, 2025.