The main source of energy for the human body is carbohydrates. While fats and proteins can also be used for energy, carbohydrates are the body’s preferred source due to their rapid conversion into glucose, the primary fuel for cells. Foods rich in carbohydrates include grains, fruits, vegetables, and legumes. Upon consumption, carbohydrates are broken down into simple sugars, mainly glucose, which enters the bloodstream. Insulin, produced by the pancreas, helps transport glucose into cells where it is utilized for energy needed for physical activity, growth, and bodily functions. A balanced carbohydrate intake is essential for optimal energy levels.