dr. megan jones. she's a psychologist from stanford university. welcome, doctor. >> hi. thanks for having me. >> so that we're all on the same page, what exactly are eating disorders? >> eating disorders are conditions that occur when you are not eating in a healthy way. and what i mean by that is where you're trying to overly control your eating by cutting out food groups, not eating enough, or feeling like you're losing control over your eating, and where you feel really guilty and maybe even feel ashamed about how you look and how you're eating. >> okay. when you look at models and you see them so thin, i mean, isn't it healthier to be thin than to be chubby? >> well, that's not necessarily true. so, when you look at models who are, like, on fashion runways, they're not healthy. that kind of thin is actually very, very dangerous. and when you look at people who are overweight, they might actually be much, much healthier physically and emotionally than those models on a runway. >> so you're saying that it's actually unhealthy for teens to compare ourselves to fashion m