Teenagers are significantly more likely to be aggressive and violent if they regularly consume fizzy soft drinks, a study has found.
Consumption of more than five cans of non-diet carbonated drinks a week was linked with behaviour that included carrying weapons and violent assaults.
The US researchers do not yet know if the link is causal, but have not ruled this out. It may be that unknown factors causing aggression in youngsters also influence their dietary habits.
The findings, reported online in the journal Injury Prevention, are based on a survey of 1,878 teenagers aged 14 to 18 from 22 state schools in Boston.
Participants were asked how many non-diet fizzy soft drinks they had consumed over the past week. The scientists then looked for potential links to violent behaviour.