are fruits a carbohydrate
1 Sugar is the simplest form of carbohydrates. 2  Sugar occurs naturally in some foods, including fruits, vegetables, milk and milk products. 3  Sugars include fruit sugar (fructose), table sugar (sucrose) and milk sugar (lactose). 4  Starch. 5  Starch is a complex carbohydrate, meaning it is made of many sugar units bonded together.