Researchers behind a newly published study found that people who ate more ultra-processed foods faced elevated odds of developing a range of health conditions, including a higher likelihood of premature death. Drawing on data pooled from close to nine million participants across four countries — China, Singapore, South Korea, and India — the research team identified elevated rates of cancer, obesity, diabetes, and all-cause mortality among people whose diets contained higher proportions of ultra-processed foods.
Elevating intake of heavily processed foods — even by modest amounts — was linked in the research to a measurable uptick in the likelihood of developing particular health conditions. Findings from the research appeared in the pages of Family Medicine and Community Health, with a publication date of 22 September.
Preservatives, emulsifiers, sweeteners, and synthetic colorings and flavorings are among the additives commonly found in ultra-processed foods — compounds that food scientists note tend to originate in industrial manufacturing rather than home cooking. Sodas fall into this group, as do prepackaged snack items — chips, cookies, crackers, and candy — along with boxed macaroni and cheese, frozen and ready-to-eat meals, lunch meats, jerky, and hot dogs.
Pooling data from 51 prospective cohort studies spanning four continents — the Americas, Europe, Asia, and Oceania — and drawing on nearly 8.82 million participants in total, the research team identified links between greater intake of ultra-processed foods and elevated rates of multiple adverse health outcomes. Elevated likelihood of cardiovascular events (by 24 percent), cancer (by 12 percent), obesity or overweight status (by 23 percent), metabolic syndrome or diabetes (by 24 percent), depression or anxiety (by 27 percent), digestive diseases (by 31 percent), and all-cause mortality (by 18 percent) were each recorded among the associated health outcomes.
A parallel line of inquiry examined whether shifts in how much ultra-processed food people ate corresponded to shifts in their level of risk. Each additional 100-gram daily portion of that food group was linked to a 14% greater likelihood of cardiovascular events, an 11% uptick in hypertension risk, a 4% rise in cancer probability, a 3% increase in all-cause mortality, and a 2% higher chance of developing metabolic syndrome or diabetes. Among the study's findings, a rise in caloric consumption by one-tenth was linked to a 16 percent greater likelihood of developing metabolic syndrome or diabetes.
The team behind the study drew a clear line between correlation and causation, noting that while links were observed between ultra-processed food intake and the named health conditions, nothing in the data establishes that eating such foods directly triggers those outcomes.
Nutrition researcher Maya Vadiveloo, based at the University of Rhode Island, noted that ultra-processed foods account for more than half of daily calorie intake among many people — a proportion she described as consistent with dietary patterns that raise the likelihood of chronic disease. Frequent intake of nutrient-poor foods likely crowds out the dietary choices — whole grains, vegetables, and other items foregrounded in American Heart Association guidance — that research ties to lower rates of chronic illness, she noted.
Vadiveloo described the results as broadly aligned with earlier prospective cohorts and meta-analyses pointing to an adverse relationship between total ultra-processed food intake and a range of health outcomes, while adding that the underlying evidence base carries generally low certainty — a limitation she attributed largely to variability within the ultra-processed food category itself and to constraints in how dietary intake is measured. Separately, Fang Fang Zhang, a nutritional epidemiology and data science professor at Tufts University, advised restraint in drawing conclusions about cancer specifically, noting that the picture across studies examining ultra-processed food consumption in relation to cancer risk has been less consistent than in other areas.
Among the concerns Zhang raised about the review's methodology was what she described as an incomplete evidence base — noting that several large-scale cohort studies examining the relationship between ultra-processed food consumption and breast cancer incidence, including PLCO, NutriNet-Santé, UK Biobank, NIH-AARP, and EPIC, had not been incorporated into the analysis. Published in Advances in Nutrition, a separate paper found that the relationship between ultra-processed foods and adverse health outcomes remained inconsistent across the available evidence, a finding that sits alongside a broader body of research tying such foods to various conditions — though the precise mechanisms through which they affect the body are not yet fully understood.
Among the explanations put forward is the idea that diets heavy in ultra-processed foods may drive persistent low-level inflammation in the body, while also exposing people to elevated levels of contaminants, along with differences in macronutrient composition and overall caloric load. Research points to these foods being well-liked for their taste, though that palatability comes paired with fluctuations in blood glucose levels.
Research published by Kristina Petersen, a nutritional sciences professor at Pennsylvania State University, points to a pattern in which greater consumption of ultra-processed foods correlates with elevated obesity rates — a condition she described as carrying heightened probability of a broad spectrum of negative health outcomes — while diets weighted heavily toward such products tend to leave the body short of essential nutrients, potentially undermining gut microbiome balance and the integrity of the gut lining.
Dalia Perelman, a dietitian researcher at Stanford University, told a news outlet that considerable gaps remain in understanding which foods pose the greatest concern and whether the associations observed in the data are driven by specific ingredients, additives, nutritional makeup, alterations to food structure, other processing-related factors, or some combination thereof. She went on to note that this uncertainty does not diminish what the existing body of evidence already supports — namely, that diets built around minimally processed, nutrient-dense foods such as vegetables, fruits, whole grains, legumes, nuts, and seeds are backed by strong research. Petersen separately indicated that establishing an evidence-based definition of ultra-processed food, one that captures the precise components tied to epidemiological patterns, would support efforts to address diseases linked to consumption of such products.
Three nutrition researchers offered related but distinct perspectives on food labelling and dietary access: one argued that healthier, nutrient-rich options need to become more affordable and easier to obtain, while also supporting front-of-pack labelling requirements — particularly for products high in added sugars, sodium, and saturated fat; a second noted that front-of-pack labelling aids shoppers because ultra-processed products are not always identifiable as such, pointing out that those items are extensively marketed, broadly accessible, and frequently presented as convenient or wholesome, making it unreasonable to expect individuals to interpret the food environment without clearer guidance; and a third cautioned that the takeaway for consumers should not be that every ultra-processed item must be cut out entirely.
Proponents argue that lowering the cost and improving the availability of nutritious, lightly processed foods would position them as the practical default for time-pressed shoppers, with the view that expanding access to those options would reduce the degree to which people turn to heavily processed food with lower nutritional value.
