The digestive system of people and animals requires both essential compounds for energy and maintenance plus bulk to activate the associated muscular systems to keep the system in good operation. Our digestive systems have evolved to utilize all the elements of currently available foods and one of those elements is bulk and fiber. You might get by a few days on energy pills but would rapidly end up constipated by a longer trial of minimum food. I enjoy eating a good meal well prepared and a good deal of my pleasure is generated in the preparation. The concept of living on flavorless pills is totally repugnant to me and would be dangerous to any normal physiology.

Man, to get the fiber your body needs for your digestive tract to function that pill would be freakin' huuuge!!

I suppose one could take multi-vitamins and wash 'em down with a half gallon of Metimucil followed by a protein shake and survive a month or two...

Come to think of it, this sounds suspiciously like a fast weight loss diet program I once heard about on morning TV.