Liquid diets are not for everyone; they may be successful for some and not for others.  Any kind of dieting requires a highly motivated and disciplined person.  Many people on the medically supervised liquid diets started showing vast improvements in health after only a few weeks of dieting.  This effectiveness was tested by electrocardiograms as well as weekly blood tests which measured the levels of sodium, potassium, and other blood nutrients.  Reduction in their blood lipids, blood sugars, and blood pressure were shown to occur.  Some patients with diabetes, high blood pressure, or high cholesterol can reduce their medications due to the health benefits from their diet.  In addition to improving health, many disciplined people lose considerable amounts of weight.  The more obese the person is, the more weight is lost. 

The diets proved most effective are the ones combining liquid diets with exercise and behavioral modification classes.  Without support classes, people will revert back to their old habits and regain their weight when they are finished dieting.  Dieting without learning how to make it a long term change in eating behavior will lead to the everlasting gaining and losing weight which causes the yo-yo effect.