The most common type of carbohydrate in foods is "starch." Starch is a polysaccharide that serves as a key energy source for humans and animals. It is found abundantly in staple foods such as potatoes, rice, wheat, and corn. When consumed, starches are broken down into glucose, which the body uses for energy. Starch can vary in structure; some forms are more easily digestible, while others release energy more slowly. In addition to starch, other carbohydrates include sugars and fiber, all of which play vital roles in health and nutrition.