A large European study finds that ultra processed foods leave measurable changes in blood chemistry tied to heart disease and diabetes risk.
A large scale study is offering new insight into how ultra processed foods affect the body, identifying a distinct pattern in blood chemistry among people who eat a lot of them. The research adds biological weight to years of observational links between heavily processed diets and chronic disease.
What counts as ultra processed
Ultra processed foods go through heavy industrial processing and typically pack in additives, sugar, fat and sodium. Sugary drinks, packaged snacks and reconstituted meat products fall into this category. They tend to be convenient and easy to reach for, but researchers say the long term cost to health is becoming harder to ignore.
What the research actually found
People with high UPF intake showed higher levels of harmful fatty acids in their blood alongside lower levels of beneficial ones. Their bodies also appeared to produce more cholesterol while processing healthy lipids less efficiently. The pattern lines up with previously documented risks tied to processed diets, including cardiovascular disease, type 2 diabetes and obesity.
How researchers measured processing levels
Published in Critical Reviews in Food Science and Nutrition, the study drew on the EPIC cohort, which tracked more than 520,000 people across ten European countries. Researchers pulled dietary questionnaires from over 15,200 participants and sorted their food choices using the NOVA classification system, which ranks foods by how processed they are.
The NOVA system breaks food into four groups. NOVA 1 covers unprocessed or minimally processed items like fresh produce. NOVA 2 includes processed culinary ingredients such as oils and sugar. NOVA 3 covers processed foods like canned vegetables. NOVA 4, the category of interest here, includes packaged snacks and sugary drinks.
Participants’ median UPF intake sat around 12.6% of total diet, though some consumed as much as 2,890 grams a day, a range researchers say underscores how differently people eat even within similar populations.
The blood chemistry changes tied to ultra processed intake
Lead author Dr. Jessica Blanco Lopez said the findings offer biological evidence connecting UPF consumption to worse health outcomes rather than relying on dietary recall alone. The study found higher levels of industrial trans fats and certain saturated fatty acids among frequent UPF eaters, along with lower levels of omega 3 fatty acids such as DHA. Researchers also noted shifts in metabolites tied to lipid and energy processing.
Dr. Thomas M Holland, a physician scientist not involved in the research, said these metabolic signatures could help explain why diets high in ultra processed foods keep showing up alongside chronic disease in study after study.
Why the findings come with limits
The study is observational, meaning it can show a strong association but cannot prove that ultra processed foods directly cause the health problems researchers observed. Replicating the results in other populations, and tracking what happens when people cut back on these foods over time, would help clarify how much of the risk is truly driven by processing itself.
Building healthier habits over time
Holland points to a broader pattern rather than a single fix, encouraging a diet built around minimally processed foods paired with regular movement, consistent sleep and stress management. He frames healthy aging as a product of steady daily habits rather than any single perfect choice.
Researchers say the growing evidence around ultra processed foods adds another reason to rethink how often they show up on a plate, even as more work remains to fully untangle cause from correlation.
