Ketogenic diet mainly refers to promoting the consumption of body fat by ingesting some foods with high fat, low carbohydrate and moderate protein, so as to achieve the purpose of losing weight. Such foods mainly include avocados, nuts, fish and shrimp, eggs, milk, soybeans and so on. The principle of ketogenic diet is that when the body takes high-fat food as the main source of nutrition, the glucose level in the body will decrease, and the state of insufficient energy will promote the decomposition and increase of fat. When adipose tissue is the main source of energy, it will be mainly catabolic, and the synthetic metabolism will be greatly reduced, thus achieving the purpose of losing weight. Although ketogenic diet can achieve the goal of rapid weight loss, it is not conducive to health, so it is not recommended to use this method to lose weight.