With the improvement of people’s standard of living, diet structure changes, resulting in more and more obese people, simply put, obesity is because the intake is greater than the consumption of the cause, in a healthy way to lose weight people preferred is exercise to lose weight, many people think that exercise plus do not eat staples weight loss effect will be better, in fact, it is not, the following we will talk about why exercise does not eat staples non-but the effect on weight loss is not good, and even will The health of the human body. The main component of the so-called staple foods is carbohydrates, which are eventually transformed into absorbable substances in the body is sugar, we exercise to lose weight is to increase the breakdown of fat metabolism, but in the fat metabolism, its intermediate products must be combined with the intermediate product of aerobic oxidation of sugar oxaloacetate to enter the aerobic oxidation pathway and be completely oxidized, so fat in the body want to completely oxidized must have sugar metabolism Therefore, for the complete oxidation of fat in the body, sugar metabolism must be involved. Otherwise, fat metabolism will be affected. If in addition to a long period of exercise is bound to lead to a decline in sugar stores, then the intermediate product of fat metabolism ketone bodies will certainly increase, which will not only lead to an increase in blood ketone body concentration, acidification of body fluids, affecting the ability to exercise, but also affect the health and mental state decline. So it is said that proper supplementation of carbohydrates after exercise can prevent the occurrence of the above-mentioned phenomenon, which can ensure the metabolism of fat and also restore the decline of physical strength after exercise. This is the so-called anti-ketogenic effect of carbohydrates.