Carbohydrates are sugar and starches found in foods like bread, cereals, fruits, vegetables, pasta, milk, honey, syrups, and table sugar. Carbohydrates are the preferred source of energy for your body. Regardless of origin, your body breaks down carbohydrates into glucose that your blood carries to cells to be used for energy. Carbohydrates provide 4 calories per gram, while fat provides 9 calories per gram. Your body cannot differentiate between glucose that comes from starches or sugars. Glucose from either source provides energy for working muscles.