UPFs tied to preschool behavior
A new large Canadian analysis published recently links higher ultra‑processed food (UPF) intake at age 3 with increased anxiety, aggression and hyperactivity in preschoolers—adding behavioral risk to UPF’s cardiometabolic harms Healio The Week. The report reinforces public‑health calls to limit UPF exposure in early life, where diet shapes both metabolism and behavior long term The Week.
The analysis was published March 3, 2026 in JAMA Network Open (jamanetwork.com) and used data from the Canadian CHILD Cohort Study covering births enrolled between September 2011 and April 2018. (nutritional-psychology.org) Researchers analyzed 2,077 children with dietary data at age 3 and behavioral assessments at age 5 (Child Behavior Checklist outcomes) in the main sample. (news-medical.net) The team reported that every 10% increase in daily energy from ultra‑processed foods was associated with higher caregiver‑reported behavioral and emotional symptom scores at age 5, with separate increases seen across internalizing and externalizing subscales. (jamanetwork.com) Effect sizes were described in the paper as modest rather than large, and independent expert reactions noted the associations were small compared with clinical thresholds for diagnosis. (sciencemediacentre.org) In the cohort, ultra‑processed products contributed roughly half of preschoolers’ calories in Canada, and the authors modelled that replacing UPF calories with minimally processed foods predicted lower behavioral symptom scores. (utoronto.ca) Analyses were multivariable adjusted and included sensitivity checks; the paper reports both a multiple‑imputed dataset (n=2,077) and a complete‑case analysis (n=1,492) to test robustness. (jamanetwork.com) The study was funded in part by the Canadian Institutes of Health Research and a Temerty Faculty of Medicine pathway grant, and the authors recommended evaluating early‑life nutrition interventions such as childcare nutrition standards and food reformulation. (bhnet.org)
