There are all kinds of diets, from the all cabbage diet to the all soup diet. In the 80’s, there was a high protein, all liquid diet that was very popular, however, there were several problems noted with this plan. A better liquid protein supplement has been found, however, there still remain a number of problems with an all liquid diet of any kind, no matter how nutritious or delicious that the liquid might be. With over 34 million people listed as being obese, it is no wonder that so many different diet plans have been devised. (Source: www.med.Stanford.edu)