Peer-reviewed article
The "pro-inflammatory imprint" of ultra-processed food exposure: a review of mechanisms affecting child and adolescent health and development via the gut microbiome-inflammation axis.
Liu Q, Luo L, Yan Z, Yang P, Long T et al. ·
Summary
Written by AI, not yet AICS's view · claude-haiku-4-5-20251001This review examines how ultra-processed foods may harm children's health through effects on the gut microbiome and inflammation. The authors synthesize evidence from studies in children and adults, along with laboratory research, to understand how dietary processing and nutrient content might affect metabolic health, thinking, and brain development. The review proposes a new research framework to help measure these effects and identifies gaps in current knowledge. The authors emphasize that more research is needed before this framework can guide clinical or public health decisions.
Key points
- Ultra-processed food consumption is widespread in children's diets and raises concerns about long-term health effects
- Evidence suggests a 'pro-inflammatory imprint' pathway involving the gut microbiome and inflammation that may affect metabolic, cognitive, and neurodevelopmental outcomes
- The review distinguishes between direct evidence (from child studies) and indirect evidence (from adult and laboratory studies)
- Commercial determinants and environmental factors play a role in shaping children's food consumption and health
- The proposed Pediatric-Specific Integrated Dietary Inflammatory Index (cP-IDII) is unvalidated and requires external validation before use in clinical or public health decision-making
Limitations
This is a narrative synthesis review rather than a systematic review, so it may not comprehensively capture all available evidence. The proposed cP-IDII framework is hypothesis-generating and unvalidated, so the review cannot yet provide definitive guidance for clinical or policy decisions.
Abstract
The prevalence of ultra-processed food (UPF) consumption in pediatric diets has raised significant concerns regarding long-term health. This review examines evidence for a proposed 'pro-inflammatory imprint' involving the gut microbiome-inflammation axis. Using a structured narrative synthesis of pediatric observational evidence, adult intervention studies, preclinical research, multi-omics data, and public health evaluations, we examine associations between UPF exposure and metabolic, inflammatory, cognitive, and neurodevelopmental outcomes while distinguishing direct from indirect evidence. We propose the Pediatric-Specific Integrated Dietary Inflammatory Index (cP-IDII) as an unvalidated, hypothesis-generating research framework for integrating reproducible nutrient- and processing-related dietary exposures; downstream microbial, intestinal-barrier, inflammatory, metabolic, and immune measures are reserved for external validation. Furthermore, we discuss the role of commercial determinants and environmental factors in shaping child health. The synthesis identifies measurement gaps and complementary policy entry points across product composition, food environments, affordability, and marketing. Empirical development and external validation are required before the cP-IDII can be used for clinical, epidemiological, or public health decision-making.