Ultra-Processed Food Intake Leaves Distinct Blood Fat and Metabolite Signatures

The work was published in 2026 in Critical Reviews in Food Science and Nutrition. It is an observational study in people, drawn from the European Prospective Investigation into Cancer and Nutrition, known as EPIC. Observational means the researchers measured what people ate and what was in their blood. They did not assign anyone a diet. That limits what the results can show.

The analysis used two groups of participants from EPIC nested case-control studies. One group of 6,177 people had data on 129 endogenous metabolites, which are small molecules the body makes or uses in everyday chemistry. A second group of 9,029 people had data on 37 fatty acids in blood plasma.

The team sorted foods into four groups using the Nova system, which ranks foods by how much industrial processing they have had. Ultra-processed food was one of those groups. Intake was measured in grams per day. The researchers compared it with blood measures using linear and LASSO regression. These are statistical methods for finding which measures track with intake. The models were adjusted for demographic, lifestyle and dietary factors.

Higher ultra-processed food intake was associated with 22 circulating metabolites and eight plasma fatty acids. Most of the metabolite links were inverse, meaning levels were lower in people who ate more of these foods. They included compounds involved in energy metabolism, such as asparagine, and in fat metabolism, such as propionyl carnitine, glycerophospholipids and sphingomyelins.

The fatty acid findings ran the other way. Higher intake was associated with higher levels of industrial trans fats, such as elaidic acid. It was also linked to higher longchain saturated fats, such as stearic acid, and n-6 polyunsaturated fats, such as dihomo-γ-linolenic acid.

The authors conclude that ultra-processed food consumption "is associated with distinct metabolic and fatty acid profiles." They say this offers insight into possible biological pathways linking these foods to poorer health. So the study does not show that these blood changes cause disease. It also does not show that the foods caused the changes.

The work adds a different angle to the paper's October 18 report, "Higher Ultra-Processed Food Intake Linked to Silent Brain Damage on MRI." That was a separate study, in JAMA Network Open, which looked at brain scans. This one looks at blood chemistry. Together they ask how these foods might relate to long-term health, but neither shows cause.

What to watch next is whether other studies confirm these blood signatures and test whether they help explain links between ultra-processed food and chronic disease.

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