The essence of ketogenic diet is that the body consumes fat to provide energy, so as to achieve the purpose of reducing fat and weight. This method can indeed lose weight in the short term, but the long-term effect (more than 1-2 years) is not significant, and it may cause damage to the body, leading to acidosis, increasing the burden on the kidneys, etc. Once the normal diet is restored, it is easy to regain weight.