Study links ultra-processed foods to higher cancer risk

A meta-analysis published by the Chinese Medicine Hospital in Nanjing on July 15, 2026, found that ultra-processed foods, particularly industrial meat products, are associated with an increased risk of digestive system cancers. The study compiled data from four million participants across eight countries, including France, the United Kingdom, and the United States.

Analysis included multiple studies

The analysis included fourteen studies published between 2019 and 2025, with nine following participants over several years and five comparing cancer patients to healthy individuals. These studies aimed to understand the long-term health effects of consuming highly processed foods.

Risk varies by study type

The studies found that the largest consumers of ultra-processed foods had a 12% increased risk of digestive cancers compared to the smallest consumers, while studies comparing patients to healthy individuals showed an increase of 42%. However, this figure is considered fragile due to the reliance on participants' recollections of their past diets.

Focus on highly processed foods

The meta-analysis focused on the NOVA 4 group products, the most processed category in the NOVA classification system. The authors rated each study as good quality, indicating that the research methods were reliable and consistent across the board.

Cancer risks vary by type

The findings indicate that colorectal cancer risk increases by 14 to 22% depending on the colon segment, while stomach cancer risk increases by 43%. Data on esophageal and pancreatic cancers remain too limited for conclusive results, highlighting the need for further research in these areas.