The fast diet, also known as the "5/2 fasting method", was invented by Michael, a British doctor of medicine. A new weight-loss method initiated by Mosley, that is, only 500 kcal (for girls) or 600 kcal (for boys) is consumed every day for two consecutive days in a week, and the rest five days are free to eat without control. With the development of the times, great changes have taken place in our eating habits. Eating and drinking all day has become the "normal state" of our lives, and the energy intake every day is generally beyond the standard. Fasting is catering to the trend of low-calorie diet. Studies have shown that the benefits of fasting go far beyond losing weight, but also protecting the brain and resisting aging. Control diabetes and lower blood sugar; Detoxification and organ purification; Improve immune function; Prevention of cancer; Improve mood, resist depression and prolong life.