In all hunter-gatherer societies that existed well into the last century, no diseases of modern man were found and some of these societies also included a separate class of seniors, who lived to very ripe old ages. In caveman days, early deaths were due to accidents, infections and childbirth. No evidence has ever been found that any of them had diabetes, obesity, arthrities, tooth decay that is now prevalent in our society in people under the age of 30. In fact, in autopsies done on our young soldiers that died in battle within the last 20 years, blocked, plaque filled arteries were found in seemingly healthy, active, fit young men and women.

Regarding exclusive meat eating, several hunter-gatherer societies existed exclusively on meat and fish, because there was nothing else available in the far north.