Ultra-Processed Foods Linked to Higher Cancer Death Risk in Survivors: Study

New research suggests that ultraprocessed foods (UPF) may pose a particularly significant health risk for cancer survivors. A study published in February 4, 2026, in Cancer Epidemiology, Biomarkers & Prevention, found a strong association between high consumption of these foods and increased risk of both cancer-specific and all-cause mortality in individuals who have survived a cancer diagnosis.

Italian researchers followed a cohort of cancer survivors for 15 years and observed that those with the highest intake of UPF had a 59% higher risk of dying from cancer, and a 48% higher risk of death from any cause, compared to those who consumed the least amount of these foods.

The study authors noted that approximately 37% of this association could be explained by elevated levels of inflammatory markers and resting heart rate.

“We already knew there was an increased risk of developing cancer linked to ultraprocessed foods,” explained Professor David Labbé, a researcher with the cancer research program at the McGill University Health Centre, “Now, there is evidence that there is an increased risk of dying, either from cancer or other causes.”

While the study points to a clear correlation, the precise mechanisms underlying this increased risk remain incompletely understood. Professor Labbé cautioned that approximately one-third of the observed association was linked to inflammation and elevated resting heart rate, leaving the remaining factors less clear.

He also raised the possibility of selection bias influencing the results. “Perhaps these are patients in poorer health,” he suggested. “Perhaps that’s why they consume more ultraprocessed foods. Perhaps they had a cancer or a more aggressive treatment. Perhaps they are no longer able to cook at home with better quality ingredients.”

The study authors explained that the industrial processing of foods can interfere with metabolic processes, disrupt gut microbiota, and promote inflammation. They argue that even if an UPF has a similar calorie count and nutritional composition to a minimally processed or “natural” food, it may still have a more detrimental effect on the body.

“We can’t really prevent cancer, but we can reduce the risk of developing it,” said Professor Labbé. “This proves important to limit the consumption of processed foods rich in added sugars, processed meats, sugary drinks, etc.”

Ultraprocessed foods are those produced industrially and contain ingredients not typically found in a home kitchen, such as emulsifiers, preservatives, artificial colors, and flavorings. This broad category includes items like sugary drinks, instant noodles, and chips, as well as less obvious examples like flavored yogurts and commercially prepared whole-wheat breads.

According to recent data, UPFs currently account for nearly 45% of the daily energy intake of Canadian adults aged 20 years and older.

The Italian researchers utilized the Nova food classification system, which categorizes foods into four groups: unprocessed or minimally processed foods (green category); processed culinary ingredients (yellow category); processed foods (orange category); and ultraprocessed foods (red category). The Nova classification has demonstrated effectiveness in contributing to weight loss and managing conditions like diabetes, although it remains relatively unknown in Quebec.

Professor Labbé emphasized that, despite the incomplete understanding of the precise mechanisms, “there is enough smoke to say that we should, as individuals and as a society, start making choices or supporting people to move away from ultraprocessed foods.”

He drew a parallel to the history of tobacco regulation, noting that even before the specific chemical compounds responsible for increasing lung cancer risk in smokers were identified, public health measures were implemented to regulate and reduce tobacco use.

The findings underscore the importance of dietary choices for cancer survivors, and suggest that reducing UPF consumption may offer meaningful long-term health benefits. Further research is needed to fully elucidate the mechanisms driving this association and to develop targeted dietary recommendations for this vulnerable population.