Ultra-processed food and sugar-sweetened drinks
Diets high in industrially processed foods and sugary drinks are linked with more cancer, mainly through obesity but perhaps also through additives and packaging chemicals. Sugar itself does not 'feed' a tumour in the way social media claims.
In the French NutriNet-Sante cohort (BMJ 2018, n=104,980) a 10% increase in the share of ultra-processed food (UPF, NOVA group 4) in the diet was associated with a 12% higher overall cancer risk, an association since replicated in UK Biobank and EPIC for colorectal, breast and total cancer and for cancer mortality, and in a 2024 umbrella review that graded the cancer evidence as suggestive rather than convincing. Sugar-sweetened beverages are associated with obesity, type 2 diabetes and, in some cohorts, colorectal and liver cancer; sugar taxes reduce purchases by 10-20% but have no cancer outcome data yet. The mechanistic story is plural: energy density and adiposity, glycaemic load, additives (emulsifiers, nitrites, artificial sweeteners), contact-material chemicals and displacement of fibre-rich whole foods. UPF is a classification, not a mechanism, and the NOVA system's reliability is disputed. The popular corollary that dietary sugar directly feeds cancer and that cutting it starves tumours is not supported: every cell uses glucose, blood glucose is homeostatically regulated, and no trial shows sugar restriction improves cancer outcomes independent of weight.
How it works
UPF promotes over-consumption and adiposity through energy density, hyper-palatability and low satiety; specific additives and processing contaminants may add direct carcinogenic or microbiome-disrupting effects.
- Large prospective cohorts, replicated
- Policy levers (taxes, front-of-pack labels, marketing limits) exist and shift purchasing
- Overlaps with obesity and diabetes prevention
- UPF classification is heterogeneous and contested
- Confounding by socioeconomic status
- Cancer-specific mechanisms beyond adiposity unproven
Latest papers
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