PARENTS CONTROL THE SUPPLY LINES: You decide which foods to buy and when to serve them. Though kids will pester their parents for less nutrious foods, adults should be in charge when deciding which foods are regularly stocked in the house. Kids won't go hungry. They'll eat what's available in the cupboard and fridge at home. If their favorite snack isn't all that nutritious, you can still buy in once in a while so they don't feel deprived.
GIVE THEM A CHOICE: Kids need to have some say in the matter. Schedule regular meal and snack times. From the selections you offer, let them choose what to eat and how much of it they want. This may seem like a little too much freedom, But! if you follow step 1, your kids will be choosing ONLY from the foods you buy and serve.
START THEM YOUNG: Food preferences are developed early in life, so offer variety. Likes and dislikes begin forming even when kids are babies. You may need to serve a new food on several different occasions for a child to accept it. Don't force a child to eat, but offer a few bites. With older kids, ask them to try one bite.