Complex carbohydrates are a type of carbohydrate that are made up of long chains of simple sugars, known as monosaccharides. These chains can contain anywhere from three to thousands of monosaccharides, depending on the specific complex carbohydrate. Complex carbohydrates are found in a variety of foods, including: Grains and cereals Starchy vegetables such as potatoes, corn, and peas Legumes such as beans and lentils Some fruits such as bananas and pears Compared to simple carbohydrates, complex carbohydrates are digested more slowly and provide a slower release of energy. They are considered a healthier source of carbohydrates because they contain fiber and other nutrients, such as vitamins and minerals. Complex carbohydrates also help regulate blood sugar levels and promote feelings of fullness.