A person doesn't need to eat food to live. A person can live on a liquid diet for the rest of their life, as long as they get enough calories, nutrients and protein.
Meal replacement shakes (Slim-Fast, Carnation Breakfast Essentials, Ensure, Boost, Special K protein shakes, etc...) have enough calories, nutrients and protein, and fruit and vegetable juices are full of essential vitamins and minerals. An ideal liquid diet would consist of some type of meal replacement shake and juice.Living on orange juice, vegetable juice and meal replacement shakes is possible. Most of the meal replacement shakes have a full multivitamin in them, and it is possible to meet the needs of many with just the meal replacement shakes and no juice supplements.
Thanks a lot!