How does sugar hide in food?

Check the ingredients on ketchup, bologna,spaghetti sauce, soy milk, sports drinks,fish sticks, and peanut butter.You'll find sugar hiding in most of those products.In fact, you'll find added sugars in three-quarters of the more than 600,000 items available in grocery stores.But how is sugar hiding?Can't you just look on food labels?It's not that easy.