We're studying bone and muscle systems right now and I did a little thing on different athletes and the different muscles they use. I also did a little bit on nutrition and obesity. (5th grade class) I have two chubby kids in my class, not fat, just chubby kids and I could tell one was getting uncomfortable during the class. I made sure to mention that just because you're skinny doesn't mean you're healthy and just because you're bigger doesn't mean you're unhealthy. Also told them how when I was in university on my swim team I was always classified as "overweight" because I had a lot of heavy muscle, but I most certainly was not overweight. I'd like to do another lesson on nutrition, exercise and health because I think it's super important for these kids to know. But the last thing I want to do is make anyone feel bad about themselves. Any ideas on how to approach this delicately?