Ultra-Processed Foods in Early Childhood Linked to Later Behavioral Struggles

A new study from the University of Toronto highlights a troubling connection between early consumption of ultra-processed foods and later behavioural problems in children. Researchers found that preschoolers who ate more of these foods at age three showed increased emotional and behavioural difficulties by age five. The findings also reveal that nearly half of Canadian toddlers' daily calories come from ultra-processed items.

The study analysed data from the CHILD Cohort Study, focusing on children's diets at age three and their behaviour at age five. For every 10% rise in calories from ultra-processed foods, five-year-olds displayed more internalising and externalising behaviours. Sugary drinks, in particular, were tied to higher internalising behaviour scores in three-year-olds.

The most common sources of ultra-processed calories included sweets, desserts, breads, cereals, animal-based products, and ready-to-eat meals. Beyond diet, longer commutes and poor access to fresh produce markets also increased reliance on these foods. Researchers stressed the need for broader solutions, urging policies that address urban planning and food accessibility alongside nutritional guidance. While the study establishes a clear link between early ultra-processed food intake and later behavioural issues, it does not track dietary changes beyond age five. No updates on preschoolers' eating habits in the examined cities have been documented since the original data collection.

The findings underscore the importance of fostering healthy eating habits in early childhood. Doing so may help reduce behavioural challenges in later years. With nearly half of preschoolers' diets consisting of ultra-processed foods, the study calls for action at both individual and systemic levels.