I think that short life span was NOT due to eating meat but to the poor health conditions our ancestors were exposed to. I mean jeez, no medical attention for those broken bones or common colds. One bad scratch and someone could die from infection back then.

Blaming it on food is almost like throwing rocks at the moon. Cute!

I agree with Wa'il. PP is probably the most fact driven book you could lend him, however don't expect too much. Good luck!