Obesity among teens not only increases the likelihood of being bullied but also amplifies chances of them perpetrating bullying, when compared to healthy teens, a recent study has claimed.

According to the study published in the journal 'Childhood Obesity', overweight or obese adolescents who are either victims or perpetrators of bullying, or both, have significantly greater odds of having depression, behavioural problems, and difficulty making friends.

"While it is clear that as a group the obese have been more involved in bullying than other groups, it has not been clear the extent to which the obese are the victims of bullying or the source? In a large nationally representative sample, Rupp and McCoy determined that the obese were both victims and perpetrators, after controlling for likely confounders," said 'Childhood Obesity' Editor-in-Chief Tom Baranowski.

"Thus, programmes for the obese need to address both bullying victimisation and perpetration."

The researchers first compared bullying behaviour among obese and healthy weight teens where they found significant differences for bullying victimisation and both being a victim and a perpetrator.

The second component of the study involved comparing obese teens who were either victims, perpetrators, or both and their likelihood of experiencing behavioural conduct problems, depression, and excessive arguing, and having difficulty making friends.