Overweight children have more unreciprocated friendships and frenemies than their thinner counterparts, a new study has found. In a survey of 504 preteens in the Netherlands, researchers found that overweight children are excluded from friendships, call classmates friends when the feeling is not mutual and are disliked by peers. And overweight children dislike more classmates than their thinner peers. These heightened negative relationships take a mental, social and physical toll.