A new European study of more than 15,000 participants has identified 30 distinct blood markers that distinguish high ultra-processed food consumers from people who eat minimally processed diets, according to findings published from the European Prospective Investigation into Cancer and Nutrition. The metabolic signature appeared even in participants who were not overweight, suggesting body weight alone does not reflect how diet is affecting internal chemistry.

What did the study find in the blood?

Researchers analyzed blood samples from more than 15,000 people across multiple European countries. They identified 22 circulating compounds and eight blood fats that differed significantly between people who consumed higher amounts of ultra-processed foods and those who ate fewer processed items.

Among the most consistent findings:

• Lower circulating DHA: An omega-3 fatty acid primarily found in fatty fish, with higher ultra-processed food intake linked to lower DHA levels.
• Lower sphingomyelins and phosphatidylcholines: Protective cell membrane compounds found in dairy, eggs, fish, whole grains and nuts.
• Higher elaidic acid: An industrial trans fat produced by partial hydrogenation of liquid vegetable oils.
• Elevated omega-6 derivatives: Compounds produced internally as the body converts excess linoleic acid from refined vegetable oils.
• Higher acylcarnitines: Molecules associated with inefficient fat burning inside cells.

The analysis adjusted for age, sex, body weight, physical activity, smoking, alcohol use and other dietary factors.

Why does this metabolic fingerprint matter?

DHA supports brain function, heart protection and inflammation regulation. Because the body produces only small amounts of DHA on its own, dietary sources are essential.

Sphingomyelins and phosphatidylcholines help maintain cell membrane integrity and support cell signaling and energy regulation. Both are nutrients typically displaced when ultra-processed foods make up a large share of the diet.

Elaidic acid and other industrial trans fats remain in circulation rather than passing through the body. These fats raise LDL cholesterol, lower HDL cholesterol and have been linked to insulin resistance and cardiovascular disease.

The World Health Organization has recommended eliminating industrially produced trans fats from the global food supply entirely and has stated that these fats can be replaced with healthier oils without changing cost, taste or food availability. The WHO recommends limiting trans fat intake to less than 1% of total energy, or about 2.2 grams daily for a 2,000-calorie diet. The WHO also estimates that more than 278,000 deaths annually are attributable to industrially produced trans fats alone.

How does ultra-processed food shift the omega-6 to omega-3 balance?

Omega-3 levels declined with higher ultra-processed food consumption, while omega-6 fatty acid derivatives rose. According to the researchers, the omega-6 derivatives were not directly consumed in large amounts from processed foods but appeared to be produced internally as the body converted excess linoleic acid from refined vegetable oils.

Omega-6 and omega-3 pathways compete for the same enzymes in the body. When omega-6 intake is high and omega-3 intake is low, the balance tips toward producing more pro-inflammatory molecules.

What does this add to prior research?

An umbrella review in the medical literature examining 26 studies previously found that ultra-processed food consumption was associated with increased risk of all-cause mortality, Type 2 diabetes, cardiovascular disease, cancer and mental disorders in adults.

The new study does not prove that ultra-processed foods directly cause disease. It demonstrates that diet leaves measurable traces in human blood, traces that indicate whether the foods consumed are supporting or undermining long-term health.

The metabolic fingerprint appeared even in people who were not overweight, suggesting weight alone does not reliably determine whether a diet is supportive of long-term health.

What dietary pattern supports higher levels of protective compounds?

• Add fatty fish twice weekly: Salmon, sardines, mackerel and anchovies provide reliable dietary sources of DHA.
• Include whole dairy: Full-fat dairy products supply sphingomyelins and margaric acid naturally.
• Avoid partially hydrogenated oils: Check labels for hydrogenated or partially hydrogenated oils in packaged foods.
• Use whole-food fats: Olive oil, avocado oil, nuts and seeds help rebalance omega-6 to omega-3 ratios.
• Prioritize whole foods: Building meals around minimally processed foods naturally reduces ultra-processed food intake.

How were the foods categorized?

The study used the Nova classification system to categorize foods by processing degree, defining Nova 4 items as those requiring industrial processing. Ultra-processed foods are industrial formulations containing additives such as flavorings, emulsifiers, sweeteners and colorings.

How widespread is ultra-processed food consumption?

Ultra-processed foods now account for more than half of daily calorie intake in many Western nations. Common sources of industrial trans fats include margarine, vegetable shortening, fried foods, baked goods such as crackers, biscuits and pies, and many street and restaurant foods.

FAQ

How many blood compounds are linked to ultra-processed food intake?

The study identified 22 circulating compounds and eight blood fats that differed between high and low consumers of ultra-processed foods, totaling 30 distinct markers.

Does eating ultra-processed food lower DHA levels?

Yes. Higher ultra-processed food intake was associated with lower circulating levels of DHA, an omega-3 fatty acid primarily found in fatty fish that supports brain function and inflammation regulation.

Do industrial trans fats stay in the bloodstream?

Yes. The study confirmed that elaidic acid, an industrial trans fat produced through partial hydrogenation of liquid vegetable oils, appears in the bloodstream at measurable levels after consuming ultra-processed foods and remains in circulation.

This article summarizes reporting from naturalnews.com.