The water content in my body is therefore a little too low. For the rest we will not complain, but it is a fact that I would have more energy if I would drink a little more water. Muscle mass The muscle mass is the motor of our body. The largest percentage of energy conversion occurs in the muscles. The muscles ensure the maintenance of body temperature and are the basis of our body's efficiency. The control of muscle mass is very important for people with weight and fat problems.