Teach your child about nutrition by looking at the food labels for their favorite packaged snacks. You can focus on a few important parts of the label, such as the amount of sugar, saturated fat, calories, and serving size. If there is more than one ingredient in a food, it must have the ingredients listed in descending order by amount. If sugar is the first ingredient listed, that snack is made up of more sugar than any other ingredient.
Source: https://www.scripps.org/news_items/6213-7-healthy-habits-to-teach-your-kids