Consider getting a registered dietitian to speak to team members and parents. If your teen is experiencing difficulties, don't blame yourself. Instead, be part of the solution by treating your own body with respect. Our language has incorporated many myths that you may spread unconsciously. There are no good and bad foods.
All foods can fit into a healthy diet.
Talk to kids about what really is good and bad, and share your values with them. Help children learn how to get their needs met. Teach them how to ask for what they need. Criticism will not help them lose weight, it will only damage their self esteem. Teach critical thinking skills.