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Ultra-Processed Foods and Metabolic Breakdown

Today we’re taking a deep look at ultra-processed foods through a biological lens. We’ll examine the population data, controlled feeding trials, brain signaling, insulin pathways, fat cell behavior, gut microbiome changes, and how these systems interact over time. Ultra-processed foods now account for approximately 57 to 60 percent of total caloric intake among U.S. adults, and more than 65 percent among adolescents. These numbers come from repeated analyses of NHANES data published in The BMJ and The American Journal of Clinical Nutrition over the last decade. That means most calories Americans eat today come from engineered food products rather than real, intact foods. The NOVA classification system, developed by Carlos Monteiro and colleagues at the University of São Paulo, categorizes foods based on the degree of processing. Ultra-processed foods are defined as industrial formulations composed primarily of refined starches, added sugars, isolated fats, and additives designed to enhance palatability, shelf life, and texture. This is structural modification of food. Change the structure of food, and you change how the body processes it. Now let’s look at long-term outcome data. In 2019, the NutriNet-Santé cohort published findings in The BMJ after following 105,159 French adults who provided repeated 24-hour dietary records over several years. Researchers quantified the percentage of ultra-processed foods in each participant’s diet using the NOVA classification system. After adjusting for age, sex, BMI, smoking, physical activity, education level, total energy intake, and overall diet quality, they found that each 10 percent increase in ultra-processed food intake was associated with a hazard ratio of approximately 1.12 for overall cardiovascular disease. That included both heart attacks and strokes.