Are ultra-processed foods a public health hazard?

Yes — a growing body of evidence points to ultra-processed foods (UPFs) as a genuine public health concern, though some scientific caveats remain.

The evidence is substantial and mounting

In November 2025, The Lancet published a series of papers concluding that the global rise of ultra-processed foods poses a major public health threat, citing studies linking ultra-processed diets to increased risk of obesity, type 2 diabetes, high blood pressure, heart disease, chronic kidney disease, and overall higher death rates. That Lancet series found that ultra-processed foods are pushing aside fresh, minimally processed meals worldwide, with evidence linking rising UPF consumption to poorer diet quality and higher risks of chronic conditions such as obesity, diabetes, heart disease, and other long-term illnesses.

Large-scale meta-analyses back this up. One systematic review of prospective cohort studies covering over 183,000 participants found highest UPF consumption was associated with increased risk of all-cause mortality, increased risk of CVD, cerebrovascular disease, and depression. Another meta-analysis found a consistently positive association between high UPF intake and increased risk of developing diabetes (37%), hypertension (32%), hypertriglyceridemia (47%), low HDL cholesterol (43%), and obesity (32%).

A 2025 global study analyzing data from eight countries found that each 10% increase in ultra-processed food intake increases the risk of early death by 3%, meaning death between the ages of 30 and 69, and estimated that potentially 124,000 Americans die prematurely every two years due to ultra-processed food consumption.

Beyond metabolic disease, newer research links UPFs to a widening range of conditions: Type 2 diabetes, depression, and heart, kidney, and gastrointestinal diseases, plus emerging signals for Parkinson's disease, cognitive decline and stroke, and — in a 2025 JAMA Oncology study of nearly 30,000 nurses — younger women who eat more UPF, including highly processed bread, breakfast food and soda, may be more likely to develop colorectal cancer, in a study led by researchers at Harvard T.H. Chan School of Public Health.

Scientific caveats worth noting

Not all researchers view the evidence as airtight. One review cautioned that risks varied significantly depending on the methodology used to assess UPF consumption, with a difference of more than 50% between methods, and that caution should be used when interpreting and extrapolating the results. Most underlying evidence comes from observational cohort studies rather than randomized controlled trials, so causation (versus correlation with generally poorer diets) is still debated. That said, a 2025 review of systematic reviews concluded there is convincing or highly suggestive evidence of associations with 32 specific adverse health parameters and all-cause mortality.

Governments are responding

This has moved well beyond academic debate into policy. In July 2025, U.S. health agencies announced action, with HHS Secretary Robert F. Kennedy Jr. stating that "Ultra-processed foods are driving our chronic disease epidemic." The agencies launched a joint Request for Information to help establish a federally recognized uniform definition for ultra-processed foods. California went further, becoming the first U.S. state to enact a law defining and banning unhealthy ultra-processed foods from school meals, affecting over 1 billion meals served to California schoolchildren in the 2025–2026 school year.

Public opinion has shifted too — a 2025 national survey found Americans broadly support government intervention, with researchers noting Americans appear ready for stronger safeguards and holding the food industry accountable, ranging from additive testing to marketing restrictions.

Why UPFs are so hard to avoid

Part of the public health challenge is structural: UPFs are more affordable, costing 55 cents per 100 calories compared with $1.45 for unprocessed foods. This economic reality, combined with the fact that global UPF sales grew from $1.5 trillion in 2009 to $1.9 trillion in 2023, means the food industry has strong incentives to keep expanding UPF consumption even as health evidence accumulates.

Bottom line

The weight of current evidence — spanning dozens of meta-analyses, a major 2025 Lancet series, and rapid policy shifts from the FDA to California schools — supports treating ultra-processed foods as a significant public health hazard, particularly for cardiometabolic disease, certain cancers, and premature mortality. However, questions remain about which specific mechanisms (additives, texture, nutrient profile, or displacement of whole foods) drive the harm, and much of the evidence is observational rather than experimental.