Teenagers are 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 associated with behaviour that included carrying weapons and 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 in Boston.
Overall, frequent soft drink consumption was associated with a 9pc to 15pc increased likelihood of engaging in aggressive behaviour.
Violence and weapon-carrying was common among the teenagers, who largely represented ethnic minorities from poor backgrounds, but, rates of violent behaviour increased in a "dose response" as students consumed more fizzy drinks, the researchers found.