Portion control is key

Try mini boxes of raisins, individually wrapped string cheese, low-fat puddings in single servings - many snacks you buy in the supermarket are now packaged in snack-size bags, which is perfect.

Just make sure your child doesn't eat five of them in one sitting! If you're buying food that doesn't come in smaller sizes, portion it yourself into plastic bags so your kid isn't tempted to eat the whole box.