The cabbage soup diet exists in various forms, but the basic idea is that you can eat as much soup as you like, and supplement this with well defined other foods. This is an awful diet, which encourages yo-yo weightloss. Yes - you will very quickly loose weight. But you cannot sustain this diet, or this weight loss. Loosing weight rapidly is very unhealthy and causes stress to multiple body systems, particularly the heart. Most of the weight lost in this diet is not due to losing fat, but losing water. It is much better to eat healthily consistently than using dangerous diets such as this.