Ultra-Processed Food: Small Daily Portions Raise Heart Risk

Every additional one hundred grams of ultra-processed food eaten per day was tied to a 14% higher risk of cardiovascular events, including heart attacks and strokes, according to a global meta-analysis published in September 2026.

The paper appeared in Family Medicine and Community Health, an open-access BMJ journal, and pooled 51 prospective cohort studies covering nearly nine million adults in the Americas, Europe, Asia and Oceania. Twenty-five of the studies were conducted in Europe, sixteen in the Americas, eight in Asia and two in Oceania, with participants followed for two to thirty-two years. The researchers said it is among the most comprehensive examinations yet of how industrially formulated food relates to chronic disease.

The numbers behind the headline

The core finding is the dose-response pattern. Each extra daily increment of these foods was associated with an 11% higher risk of high blood pressure, a 4% higher risk of cancer, a 3% higher risk of death from any cause and a 2% higher risk of metabolic syndrome or diabetes. Separately, every ten percent increase in the share of daily calories from ultra-processed products was tied to a 16% higher risk of metabolic syndrome or diabetes.

Comparing the heaviest consumers with the lightest produced wider gaps. The highest-intake group faced a thirty-one percent higher risk of digestive diseases, a twenty-seven percent higher risk of depression or anxiety, a twenty-four percent higher risk of cardiovascular events, a twenty-three percent higher risk of obesity or overweight, an eighteen percent higher risk of death from any cause and a twelve percent higher risk of cancer. Metabolic syndrome and diabetes risk ran higher as well, echoing the dose-response results.

The authors caution that the data show association, not causation. Every included study was observational, dietary intake was self-reported, participants were eighteen or older, and heavy consumers of these foods also tend toward less exercise and more sedentary time, which researchers say is difficult to fully adjust for. Independent biostatisticians describe the statistical link as strong but say it cannot by itself prove that processing causes these illnesses.

Why the processing itself may matter

David Xiao Liu, a cardiologist at Sun Yat-Sen Memorial Hospital in Guangzhou and the study's lead author, told Medical News Today he "wasn't surprised" by the range of diseases linked to these foods, saying the analysis brought earlier findings "together in one place." He said the foods affect the body "through multiple pathways simultaneously," citing excess sugar, salt and calories, food additives, nutrients lost in manufacturing and contaminants from packaging.

Liu also pointed to what he called the "cocktail effect" of additives. The idea, he said, is that "it's not just individual additives that matter," but how mixtures combine and interact in the body, and he cited a French cohort of about one hundred thousand people in which additive exposures clustered into recognizable patterns. Compounds formed during industrial processing, including acrylamide in heat-treated foods and acrolein generated when fats are heated, have been associated with higher cardiovascular incidence. Laboratory work suggests the heavily altered physical structure of these products can disturb the gut microbiome and promote inflammation and insulin resistance.

Under the widely used NOVA classification, ultra-processed foods are ready-to-eat or heat-and-serve products that have undergone extensive industrial processing and often contain multiple additives. The category spans candy, packaged snacks, instant noodles and sugary drinks as well as processed meats, chicken nuggets, breakfast cereals and some commercially produced breads. In the United States these products accounted for 57% of energy intake in 2018, easing to 53% between 2021 and 2023, according to the meta-analysis. Intake has risen sharply in recent decades in Spain, Mexico, Brazil and China too.

The results land weeks after a far smaller University of California, San Francisco pilot study, in which twenty volunteers who cut ultra-processed food reported eased depression symptoms. That was a separate experiment focused on mood; the new analysis is far larger and concerns physical disease and mortality. Given that these conditions often cluster together, the authors wrote that cutting back on ultra-processed foods and replacing them with minimally processed alternatives "may be relevant for chronic disease prevention and primary care management," as reported by News-Medical. The full paper is available at Family Medicine and Community Health.