The best thing you can do is start young. First, instill in her a healthy body image and good eating patterns by modeling these yourself and having open conversations with her. Teach her about how her body will change as she enters puberty so she will expect the changes in body shape and size. Show her that women of all body types and sizes can be successful and independent. Talk to her about the unrealistic expectations formed by constant exposure to models and actresses who starve themselves to look emaciated. Don't nag her or focus on her eating habits, but, rather, set a healthy example and emphasize that it is what our bodies do for us that is important, not how they look.