Fat
Fat is important for the human body because it gives much energy and helps the body use the vitamins in the food. It is also good for the skin and hair. Olive oil is an especially healthy fat. Many types of fish also contain healthy fat, for example salmon, sardines, herring, and tuna. But if too much fat collects in the body, a person can become too heavy. The energy that fat gives the body must be used up by moving or working. Some vegetables like celery or carrots contribute much less to the bodies fat supply. Though being very important for the human body, it can be harmful in large amounts.