A pooled analysis of existing research, published in the open-access journal Family Medicine and Community Health, found that greater consumption of ultra-processed foods (UPFs) was associated with an elevated likelihood of developing various chronic conditions — including gastrointestinal disorders, hypertension, and metabolic syndrome or diabetes — as well as increased mortality. The review found that each additional 100 g of daily intake corresponded to a proportionally higher level of risk.

Foods classified as ultra-processed are those manufactured through multiple stages of industrial production, typically sold in a form ready to consume or requiring only brief heating. According to the researchers, these products tend to contain high levels of additives, calories, sugar, and salt, while falling short on fibre, protein, vitamins, and minerals.

With worldwide ultra-processed food intake having risen over recent decades, the research team aimed to establish whether any safe consumption thresholds exist and at what point intake levels might begin to pose health risks. Academic literature covering the topic was drawn from multiple databases, with the search window extending through late April 2026.

A total of 51 forward-looking cohort studies fulfilled the qualifying conditions for incorporation into the aggregated data review. Drawn from research conducted across the Americas, Europe, Asia, and Oceania, the collective data covered nearly 8.8 million individuals whose median ages spanned from 23 to 77 years. Follow-up durations across the studies ranged from two to 32 years.

Dietary intake of ultra-processed foods was measured across the reviewed studies through tools such as food frequency questionnaires, 24-hour dietary recall methods, or dietary history interviews. Daily UPF consumption figures, measured in grams, were translated into 50 g portion units so the team could evaluate potential health consequences of exposure.

The research tracked a range of health conditions, encompassing hypertension, cardiovascular incidents (including heart attacks, strokes, transient ischaemic attacks, coronary artery disease, and cardiovascular mortality), cancer occurrences and cancer-related deaths, metabolic syndrome and diabetes, digestive disorders, excess body weight, depression and anxiety disorders, and all-cause mortality.

When researchers combined findings across studies, they found that people who consumed more ultra-processed foods faced elevated odds of developing several long-term health conditions and dying from any cause, with those odds climbing as intake increased. Elevated intake of ultra-processed foods was linked to greater likelihood of developing cardiovascular conditions (24%), various cancers (12%), excess weight (23%), metabolic disorders including diabetes (24%), mental health conditions such as depression and anxiety (27%), gastrointestinal disease (31%), hypertension (11%), and all-cause mortality (18%).

Supplementary analysis revealed that every additional 100 grams consumed daily corresponded to elevated likelihood of cardiovascular events by 14%, cancer by 4%, all-cause mortality by 3%, and metabolic syndrome or diabetes by 2%. A 10% rise in caloric or weight-related measures corresponded to a 16% higher likelihood of developing metabolic syndrome or diabetes.

Existing research raises the possibility that interactions among numerous food additives may produce a combined effect on the body, while laboratory findings indicate that the heavily modified structural properties of ultra-processed foods could disrupt gut bacteria, trigger inflammatory responses, and impair insulin function, along with other potential consequences. Certain chemical compounds that can arise through food manufacturing processes — including acrylamide, which forms in thermally treated products, and acrolein, a byproduct of heated fats — have been linked to elevated rates of cardiovascular disease.

The team identified several constraints on their work, among them the fact that every study in the review relied on self-reported dietary data and that individuals under 18 were not included in the analysis. The research team also noted that consumption of ultra-processed foods tends to occur alongside a range of lifestyle and behavioural factors that are difficult to fully account for statistically and that may shape long-term health outcomes, including mortality. The team further noted that, because UPF-related chronic conditions frequently co-occur as multimorbidity, reducing ultra-processed food intake and substituting minimally processed options could support both disease prevention and primary care management.