Summary of findings
New research found that cancer survivors who eat more ultra-processed foods (UPFs) have substantially higher risks of death overall and from cancer specifically. Participants in the highest third of UPF intake by weight experienced about a 48% higher rate of all-cause death and a 57% higher rate of cancer death compared with those in the lowest third.
Study design and measures
The study followed more than 24,000 adults aged 35 and older in southern Italy from March 2005 through December 2022. At baseline, 802 participants were identified as cancer survivors and completed detailed dietary questionnaires. Investigators used the NOVA classification system to identify UPFs and calculated each person’s UPF proportion two ways: a weight ratio (daily weight of UPFs divided by total daily weight of foods and beverages) and an energy ratio (calories from UPFs divided by total calories). After adjusting for smoking, overall diet quality, BMI, medical history, and other potential confounders, higher UPF intake remained associated with increased mortality.
Possible mechanisms
The authors suggest that substances and additives introduced during industrial processing may affect metabolism, disrupt the gut microbiota, and promote chronic inflammation. They also point to links between higher UPF intake and elevated resting heart rate and inflammation as plausible biological pathways that could increase mortality risk among cancer survivors.
Expert perspectives
Researchers and clinicians weighing in on the study emphasized that the nature and degree of industrial processing may influence long-term health independently of nutrient content. Marialaura Bonaccio, PhD (IRCCS Neuromed), highlighted processing itself as a potential factor. Nilesh Vora, MD, noted prior evidence connecting pro-inflammatory foods with cancer recurrence and tumor-promoting processes. Dana Hunnes, PhD, emphasized that UPFs can raise oxidative stress and worsen glucose control, blood pressure, and insulin resistance—conditions that may be particularly harmful for people with a history of cancer.
Food groups and practical advice
The research grouped UPFs into seven categories but found inconsistent associations for specific groups, leading the authors to recommend focusing on overall dietary patterns rather than isolated items. The main public-health takeaway is to reduce total UPF consumption and move toward fresh, minimally processed, home-cooked foods. A practical guideline: products with more than five ingredients or any added food additives are likely to be ultra-processed.
Limitations and recommendations
This is an observational study and cannot prove causation. Nevertheless, experts say that reducing UPF intake and improving diet and exercise habits are sensible steps for cancer survivors given the potential risks and the low downside of healthier choices. The findings support prioritizing minimally processed foods as part of survivorship care and healthy living.