Life sciences · Journal article
Future · November 6, 2026
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Ultra-processed foods (UPFs) have become a dominant source of dietary energy for children in high-income countries, with consumption rising steadily over the past two decades. The NOVA classification system defines ultra-processed foods as industrially manufactured formulations built from refined substances and cosmetic additives, with minimal or no whole-food content. UPFs now account for up to 67% of total caloric intake among US youths. A growing body of evidence, predominantly from pediatric observational studies and supported by systematic reviews, links high UPF consumption in children and adolescents to obesity, adverse adiposity trajectories, insulin resistance, dyslipidemia, and other cardiometabolic risk factors. Randomized controlled feeding trials have provided experimental evidence primarily in adults and therefore do not constitute direct evidence of pediatric metabolic effects. Beyond their poor nutrient profiles, UPFs may exert harmful effects through multiple mechanistic pathways, including hyper-palatability and passive overconsumption, gut microbiome dysbiosis, chronic low-grade inflammation, mitochondrial dysfunction mediated by advanced glycation end-products, and exposure to endocrine-disrupting chemicals from food additives and packaging. This review assesses the epidemiological evidence linking UPF consumption to metabolic health outcomes among children and adolescents, explores the proposed pathophysiological mechanisms with emphasis on endocrine disruption, and discusses emerging policy interventions. As pediatric obesity and youth-onset type 2 diabetes continue to increase globally, understanding the potential contribution of UPF consumption as a modifiable dietary factor may help inform clinical counseling, research priorities, and public health strategies.