Normal eating and with increased exercise, there is weight loss, weight gain and weight loss belongs to the dynamic balance of energy metabolism and material metabolism, if the intake exceeds the consumption will lead to weight gain, intake is lower than the consumption of weight loss effect. Eating belongs to the material metabolism, intake of carbohydrates and adipose tissue, with the role of energy storage. Exercise belongs to energy metabolism, exercise will consume carbohydrates and adipose tissue, into kinetic energy and heat. Increased exercise will consume more fat and carbohydrates, providing energy support for the body, but because the diet did not increase, this part of the energy consumed more, will be provided by the body’s original storage of fat or glycogen, play a role in weight loss. Single exercise to lose weight, no exercise plus control of diet, produce weight loss will not be ideal.