I was surprised by how much I didn't like this book given its popularity, but I finally had to give myself permission to abandon a third of the way through (not something I often do). So many assertions without appropriate reasoning or citations, too much opinion without enough science. Hunter gatherers didn't worry and had it better than those who followed? They were hungry, without art or poetry or creature comforts. What about for the elderly or disabled or those who are just "weird"? I get where he's coming from, but his arguments would have been much stronger if he hadn't ignored the obvious counter-arguments. I actually started bookmarking pages I had a problem with - something I've never done before - and taking notes like "this guy must be a vegetarian". 
 Perhaps it gets better, and I'm not going to one-star a book I haven't actually finished, but do not recommend.