This is very much two books - the first is a good one about human evolution, starting with our last common ancestor with chimpanzees and moving forward from the tangled web of other species to modern humans - the second is mostly a philosophical polemic on modern health with many stylized facts but very little rigorous analysis. The first book is worth reading, as it gives not only a good overview of the evolutionary path humans took and our interesting adaptations around things like running and throwing, but I would skip the second book.