My 13 year old daughter is putting on weight. She's already quite large (10.5 stone, 5 foot 4), very inactive and boredom eats. Her older sister is skinny and getting skinnier.... I'm not sure how to address the problem with either of them - particularly not my younger daughter who gets defensive and angry if you even go near the topic. I am worried about her - does anyone have any suggestions about how I can talk to her about it in a way that's going to help???