What is the most common way humans store carbohydrate energy

            Carbohydrate is the first source of energy to human body. Glucose is the simple unit of carbohydrate which is used in respiration and produce ATP. When we eat food that contain carbohydrate, it convert into sugar units that are absorbed in small intestine. From here these sugar units travel to liver through blood where excess sugar is stored in the form of glycogen. When the body need energy this glycogen is converted to sugar through glucagon hormone and is used in respiration to produce ATP, which is necessary for  the activities of humans.