I don't agree that humans were vegetarians before the flood. Gen 7:2..."Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female." Why would there be clean and unclean animals taken on the ark? Also, the most nutritious diet is a balance of fresh organic meat and vegetables with real butter, and Unheated oils, Nuts, & NO grains, because grains are what mostly causes you to be fat... my Dr. calls it "wheat belly"-too much bread etc... You will have a hard time getting enough "fatty acids" from veggies alone...