Question: What is a liquid diet, how does it work, and how effective is it?
Answer: Liquid diets fall into the category of medically supervised diets, so that they take the calorie level to about 600-800 calories per day, sometimes even lower. So, in order to go on a liquid diet you have to see a doctor who is familiar with this kind of program. You'll actually have a screening, blood test and medical history to make sure that it's safe that you do a liquid diet.
The research is there to support liquid diets over 6-12 months. The catch is that you still have to learn how to eat. You have to, once the liquid diet program is over, you have to be taught how to eat regular food again.