[guenthert]

I was wondering about that, but not enough to do any actual research. I figure that hunter-gatherer's diet consisted of a whole lot of meat (seasonally perhaps) and then two kidneys were of advantage. My doctors recommended against eating big steaks. I wasn't eating much of those before and had no need to adjust.

I can't tell the difference (six years after the procedure), but then, I'm no athlete monitoring his performance closely.