The effect of the 21-day Purgatory diet is very good, but it is not suitable for everyone. The traditional method of dieting, generally can be 7-14 days, you can not eat or eat less, too long, it is harmful to the body. The correct way to lose weight is to drink only a small amount of water and fruit every day, and eat less rice, so as not to eat too little, and gastrointestinal disorders, and even physical dysfunction. There are certain hazards if you do not lose weight, for example, in the early stages, excessive consumption of protein in the body, especially muscle atrophy, anorexia nervosa, organ failure will occur over time, fat may be consumed, but fat produces a lot of acidic metabolites will cause metabolic acidosis and so on. In addition, the body’s essential nutrients are not effectively replenished, I personally think that the 21-day diet is not worth advocating, or should be 7-14 days to lose weight to the Valley, the effect will be better, but also safer.