Apparently these researchers have never attended a typical school:

Obese grade-school children are more likely to be the targets of bullying than their leaner peers are, a UK study suggests.
Researchers found that among more than 8,000 7-year-olds, obese boys and girls were about 50 percent more likely to be bullied over the next year than their normal-weight classmates.
On the other hand, obese boys were also more inclined to describe themselves as bullies.

The article goes on to describe behavior that is pretty obvious to anyone who has attended a grade school. Of course, they have an astute recommendation:

So besides the long-term physical health consequences of obesity, the researchers conclude, many overweight children may also face the psychological and social effects of bullying.
“This study suggests that parents, school personnel, and health professionals need to reduce the occurrence of this behavior and the social marginalisation of obese children at an early age,” they write.

But, there is nothing in the Reuter’s article that indicates that the researchers made any recommendation as to how to achieve this reduction. So I will: simply stop sending children to these institutions.