No self-improvement list is complete without a nutrition book and the Perfect Health Diet is arguably the best diet book on the market now. If you are overweight or not, feel sick, or just looking for an extra boost in health (and keep it this way), then look no further. From reading decades of studies the authors construct the optimal way to eat, destroying popular food fads in the process. They explain in sufficient detail the optimal macro-ratios, which starches are safe, which vitamins and supplements to take and what foods, or what they call toxins, to avoid. This book is a great supplement to the Paleo Manifesto as it shares its basic evolutionary perspective; we were evolved to eat non-toxic, high fat, moderate protein and carbohydrates. And, sometimes, going around with no food at all, can be a very healthy thing. If your body is not in optimal health, then it is almost no use to read the other books. Make this your priority number one.