Let them pick the menu and help make it. And don't let it become a power struggle. It's your job to provide healthy food, don't have junk in the house. It's their job to decide how much of what they will eat. Don't talk about what they're eating or how much. No comments at all. Talk about something neutral at the table, make it pleasant. Be a good example, but a silent one. I know it's hard, been there, done that.
at 2:11 PM on Oct. 16, 2010