Are ultra-processed foods a public health hazard?

Yes — the scientific and public-health consensus has shifted strongly toward viewing ultra-processed foods (UPFs) as a genuine public health hazard, and the evidence supporting this has grown substantially stronger in the last two years.

The scale of the problem

UPFs now dominate diets in many countries. UPF currently make up more than half of what U.S. adults eat on a daily basis, and two-thirds of what kids and teens eat. Globally, they can account for up to 58% of total daily energy intake in some high income countries, and have rapidly increased in many low and middle income nations in recent decades.

What the evidence shows

The most authoritative recent assessment comes from a major 2025 Lancet series written by over 40 international experts. A systematic review of 104 long-term studies found that 92 showed higher risks for at least one chronic disease, with meta-analyses identifying significant associations with 12 health conditions including obesity, type 2 diabetes, cardiovascular disease, depression, and premature death. The series concluded that this pattern increases the risk of multiple diet-related chronic diseases through various mechanisms, substantiated by more than 100 prospective studies, meta-analyses, randomised controlled trials, and mechanistic studies, covering adverse outcomes across nearly all organ systems; the totality of evidence supports the thesis that displacement of long-established dietary patterns by ultra-processed foods is a key driver of the escalating global burden of multiple diet-related chronic diseases.

An earlier umbrella review in The BMJ reached similarly broad conclusions, finding 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, and that diets high in ultra-processed food may be harmful to many body systems. A 2024 umbrella review covering nearly 10 million people found "convincing" evidence that a diet high in ultra-processed foods increases the risk of death from cardiovascular disease by 50% and the risk of anxiety by 48%, along with "highly suggestive" evidence that greater consumption increases the risk of death from heart disease by 66%, obesity by 55%, sleep disorders by 41%, Type 2 diabetes by 40%, early death from any cause by 21% and depression by 20%.

A 2025 dose-response analysis presented to the American College of Cardiology, based on a systematic review of 41 prospective cohort studies spanning the Americas, Europe, Asia and Oceania, involving a total of 8,286,940 adult patients, found that each additional 100 g/day of ultra-processed food consumption was associated with a 14.5% higher risk of hypertension, 5.9% increased risk of cardiovascular events, 1.2% increased risk of cancer, 19.5% higher risk of digestive diseases and 2.6% higher risk of all-cause mortality.

Moving beyond correlation: experimental and mechanistic evidence

Critics have long argued this research is purely correlational, but 2025 brought important causal evidence. Growing evidence has linked ultra-processed food consumption to chronic disease risk, and in 2025, this field reached a turning point, with experimental, clinical and epidemiological studies converging to elucidate the underlying mechanisms at play. Notably, a 2025 randomized controlled trial has shown the harmful effects of UPFs on weight gain and metabolic and reproductive health, regardless of excessive caloric intake.

Researchers are also identifying specific biological mechanisms. Multiple factors are suspected to explain detrimental effects of UPFs beyond their nutritional profile, including food additives — in an experimental study on mice, two widely consumed food additive emulsifiers caused transgenerational microbiota alteration that led to increased long-term susceptibility to metabolic and inflammatory diseases. Similarly, while safety assessments of food additives have traditionally been performed substance by substance, a large prospective cohort study revealed positive associations between exposure to two widely consumed food additive mixtures and higher type 2 diabetes incidence — relevant since people consume complex mixtures of additives daily.

Behavioral research adds another dimension: a Virginia Tech study found that 18- to 21-year-olds put on a diet high in ultra-processed foods were more likely to overeat — even when full. Separately, University of Michigan researchers found evidence that ultra-processed foods are not only tempting but can also be addictive, and that without proper recognition and regulation, addiction to these products could have serious consequences for global public health.

Specific disease links

Beyond the broad chronic disease categories, more specific findings continue to emerge:

Scientific consensus and policy calls

The Lancet series authors directly addressed ongoing industry pushback, stating that efforts to "manufacture scientific doubt" on the subject were similar to tactics used by the tobacco industry. French researcher Mathilde Touvier emphasized that while healthy scientific debate about UPFs is welcomed, this should be distinguished from attempts by vested interests to undermine the current evidence, concluding that the growing body of research justifies the need for policy action. Lead author Barry Popkin of UNC stated plainly: "We can say now that truly ultraprocessed food represents a clear global threat to our health."

The researchers aren't just documenting the problem — they're calling for systemic change. An international team of researchers says governments need to act urgently, stating that the evidence is clear that this food is driving chronic disease around the world. Specifically, they are calling for world policy reform with actions targeting the production, marketing and consumption of ultra-processed foods, as well as improving access to healthy food.

Important caveats

That said, legitimate scientific debate remains. There has been intense debate in scientific circles about UPFs, with some health and nutrition experts raising concerns that the term is vaguely defined and that more research is needed. The classification system is imperfect — food traditionally thought to be healthy, such as fake meat products, plant-based milks and some breads and canned vegetables, could be considered ultra-processed under current definitions, which complicates simple "avoid all UPF" messaging.

There's also a social equity dimension worth noting: UPF are frequently more affordable than less-processed foods or fresh produce, and their low cost and wide availability may drive health disparities among populations who already face hunger, undernutrition and higher rates of chronic disease.

Bottom line: The weight of evidence — spanning large observational cohorts, systematic reviews, randomized controlled trials, and emerging mechanistic studies — now strongly supports classifying ultra-processed foods as a significant public health hazard, linked to obesity, type 2 diabetes, cardiovascular disease, certain cancers, depression, and premature death. While debates about precise definitions and causal pathways continue, the scientific consensus has moved decisively toward viewing high UPF consumption as a driver (not just a marker) of chronic disease, prompting calls for regulatory and policy action similar to historical responses to tobacco.