Intermittent fasting, also known as intermittent fasting, is a popular light diet pattern in recent years, usually using a 5 x 2 pattern that is normal eating five days a week, the remaining two days to give normal 1/4 energy, that is, 500kcal/d for women and 600kcal/d for men. intermittent fasting is not a strict diet hard rules but a diet pattern. This diet pattern will not change the composition of the diet, but only slightly adjust the eating time, intermittent cutting off can achieve good weight loss results. There are two ways: first, eat normally five days a week and choose two days to eat only a small amount of food; second, eat normally eight hours a day and fast for the remaining 16 hours, this method not only can lose weight but also avoid muscle loss.