Long term liquid food diet by blending/grinding all quality foods one would normaly eat, not any weight loss or prepared drinks
I was in a car accident age 19. Jaw was wired shut, food access was limited to one broken front tooth. It was liquid diet or nothing. 
 So, I drank a lot of foods in liquid form, ( soups, etc. ) and a lot of Gerber's baby foods, and just about anything that could be pulverized in a blender. 
 I gained weight like crazy. About 15 pounds in 2 months. 
 The body takes advantage of having the harder work of digestion done for it. One of the advantages of cooking food is it's easier to digest. It is believed by some that such benefits to our life are the reason humans became the dominant force on this planet.