sources of complex carbohydrates
Many carbohydrates also supply fiber. Fiber is a type of complex carbohydrate found in foods that come from plantsâfruits, vegetables, nuts, seeds, beans, and whole grains. Eating food with fiber can prevent stomach or intestinal problems, such as constipation.It might also help lower cholesterol and blood sugar.iber is a type of complex carbohydrate found in foods that come from plantsâfruits, vegetables, nuts, seeds, beans, and whole grains. Eating food with fiber can prevent stomach or intestinal problems, such as constipation. It might also help lower cholesterol and blood sugar.