With all the focus on the childhood obesity epidemic, we’d be foolish to think that teens don’t care about their bodies. They’re just as, or perhaps even more, obsessed these days with looking good -- which means ripped muscles for boys and super-skinny with toned biceps for girls.

In fact the vast majority of teens reported in a study published Monday in the journal Pediatrics that they’ve changed their eating and exercise patterns in an effort to gain muscle or look more in shape.