Cygirl: not many wild animals get much variety in their foods, especially carnivorous animals. Oh, they may eat different animals depending on their availability, but their exclusive meat diet keeps them in top health. As it did for the eskimos (som living their whole lives only on seal, or only on fish, or only on caribou, or a mix of the three), or many other wild tribes of «primitive» humans.

IMHO, variety in nutrition is overrated.