Are ultra-processed foods a public health hazard?

Yes — evidence increasingly shows ultra-processed foods (UPFs) are a significant public health hazard

The evidence base has become substantial and, as of late 2025, many experts consider the science strong enough to warrant action rather than more waiting.

What the evidence shows

Scale of exposure: The U.S. is among the biggest consumers of UPF in the world, with UPF currently making up more than half of what U.S. adults eat daily, and two-thirds of what kids and teens eat.

Strength and breadth of associations: A major umbrella review found consistent evidence that higher exposure to ultra-processed foods is associated with an increased risk of 32 damaging health outcomes including cancer, major heart and lung conditions, mental health disorders, and early death, based on an umbrella review of 45 distinct pooled meta-analyses from 14 review articles. Specifically, this review found convincing evidence that higher ultra-processed food intake was associated with around a 50% increased risk of cardiovascular disease related death, a 48-53% higher risk of anxiety and common mental disorders, and a 12% greater risk of type 2 diabetes.

A more recent analysis reviewing dozens of studies similarly found consuming higher amounts of ultra-processed foods was associated with an increased risk of heart disease, strokes, obesity, diabetes, depression and anxiety, digestive issues and cancer, based on a review of over 50 studies evaluating nearly 9 million adults worldwide.

Mortality impact: A 2025 global study found a dose-response relationship where each 10% increase in ultra-processed food intake increases the risk of early death (ages 30-69) by 3%, estimating that potentially 124,000 Americans die prematurely every two years due to ultra-processed food consumption.

Specific disease links: Newer research has also tied UPFs to colorectal cancer—a Harvard study found younger women who eat more UPF, including highly processed bread, breakfast food and soda, may be more likely to develop colorectal cancer, based on a robust data set of nearly 30,000 nurses.

Causal mechanisms emerging: Beyond correlational data, 2025 brought experimental evidence. A 2025 randomized controlled trial showed harmful effects of UPFs on weight gain and metabolic and reproductive health, regardless of excessive caloric intake. Researchers also found that in an experimental mouse study, two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased long-term susceptibility to metabolic and inflammatory diseases.

The major scientific consensus statement

In November 2025, a landmark three-part series in The Lancet, authored by 43 international experts, declared that the rise of ultra-processed foods in human diets is damaging public health, fuelling chronic diseases worldwide, and deepening health inequalities, requiring a unified global response that confronts corporate power and transforms food systems. The series included a systematic review where a review of 104 long-term studies found that 92 showed higher risks for at least one health outcome. The authors explicitly argued that although more research on UPFs will continue to be valuable, the current science is already strong enough to justify immediate public health action, and waiting for further studies would allow UPFs to gain an even stronger hold in global diets.

Important caveats and nuance

The evidence isn't uniformly strong across all outcomes, and the UPF concept itself has critics. The value of the UPF concept is not universally accepted. A nutrition-focused review notes that weak to no evidence was found for many site-specific cancers, including breast, central nervous system, pancreatic and prostate cancer, as well as for conditions such as hypertriglyceridemia, Crohn's disease, and non-alcoholic fatty liver disease. Similarly, one meta-analysis cautioned that risks varied significantly depending on the methodology used to assess UPF consumption, with differences of more than 50% between methods, so caution should be used when interpreting and extrapolating results.

Bottom line

While debate continues over why exactly UPFs are harmful (nutrient profile vs. additives vs. food matrix disruption vs. other mechanisms), the convergence of large epidemiological studies, meta-analyses, and now randomized controlled trials and mechanistic animal studies has pushed a growing consensus among major health bodies and researchers that UPFs represent a genuine and significant public health concern—serious enough that leading medical journals are now calling for coordinated policy action rather than waiting for more data.