Pioneer, I want to make my point on only 2 thinngs here:
#1. Human protein is made from "8 essential amino acids" and some that the body does make. The liver makes our protien. Amino acids in raw fruit and vegetables is bio-available. Animal flesh has to be broken completely down to amino acids before it can be used ... extra work for the body.
#2. Eating fruit and drinking the juice of a fruit that is what is in season would have to be the closest to natural that you can get. In a world minus grocery stores, isn't that exactly what we'd be doing? Wouldn't that fruit be giving us the perfect solar energy for the time of year, etc?