The short version of all this is “eat how we used to eat before we started getting obese”. Very sensible, and probably effective. There is a big problem, though. The underlying nutritional and metabolic science presented here is far from settled. The controversy around the diet-heart hypothesis still rages. The question of vegetable oils versus saturated fats — the old butter versus margarine debate — is still open. Jenkinson is too one-sided. And any book that claims to have all the answers is selling you a diet, after all, not science.