You may have noticed that you feel hungry a lot. This is natural----during teens, a person's body needs more nutrients  to grow. Snacks are a great way to satisfy that hunger and get all the vitamins and nutrients your body needs. But you need to pay attention to what you eat. Filling your stomach with a lot of fries after class may give you a short-time help, but a snack high in fat and calories will only slow you down in the long time. To keep energy levels going---and avoid gain weight---keep away from foods like candy or soda. Look for foods like bread and grains and combine them with some food like peanut butter or low-fat milk or cheese. Choosing healthy snacks means shopping smart. Be careful of the health instructions on food bags. Here are some things to watch out for. That something is "all natural " doesn't necessarily mean that it's nutrients. For example, "all natural" juice drinks or sodas can be filled with sugar (which means they'll be high in calories and give you little nutrition.) A granola bar   is a good example of a snack that people think is healthy. Although granola bars can be a good source of certain vitamins and nutrients, may also contain a great deal of fat, including a particularly harmful type of fat called trans fat. Check the Nutrition Facts instructions on the bag to be sure. People consider granola bar a healthy snack because  _  .
it contains some vitamins and nutrients it provides much fat it contains a great deal of fat it is a good source of calories