A new study has found that what young children eat may play a significant role in their mental health, with higher consumption of fruit and vegetables linked to fewer emotional difficulties and unhealthy snacks associated with behavioural challenges.
Researchers from the University of Agder reported that children who regularly eat fruits and vegetables tend to show lower levels of internalised problems such as anxiety, depression and social withdrawal. In contrast, those who frequently consume sweet and salty snacks are more likely to experience externalised issues, including aggression and attention difficulties.
The findings, published in the Nutrients, add to growing evidence that diet may influence early childhood development beyond physical health.
The study analysed data from 363 four-year-old children and their mothers, drawing on the Early Food for Future Health project in Norway. This long-term research programme focuses on improving dietary habits during infancy, particularly between six and 12 months of age.
According to the researchers, the link between diet and mental health remained significant even after accounting for factors such as maternal education, financial challenges and maternal mental health conditions. Children who consumed more fruits and vegetables consistently showed fewer signs of emotional distress, regardless of these background influences.
At the same time, frequent intake of processed snacks was associated with what researchers described as “acting-out” behaviours. These include aggression, defiance and difficulty maintaining attention — issues that are among the most common reasons children are referred to mental health services.
Experts say such behavioural patterns often emerge early in life and can persist over time. The study noted that children who display externalising problems as early as two or three years old are likely to continue experiencing similar challenges as they grow older, affecting school performance and social development.
The researchers highlighted that mental health in early childhood is closely tied to long-term outcomes, including education, relationships and overall well-being. As a result, identifying modifiable factors such as diet could help reduce the risk of future problems.
“Mental health challenges are increasing worldwide,” the study authors said, stressing the importance of early intervention. They added that focusing on young children offers the greatest opportunity to influence lifelong health and social outcomes.
While the study does not establish direct causation, it points to diet as a potentially important factor in shaping children’s emotional and behavioural development. The researchers called for further studies to better understand how nutrition interacts with other influences during early childhood.
The findings come as health experts continue to examine how lifestyle factors, including diet, are contributing to rising mental health concerns among young people globally.
