I would suggest taking a pass on this book unless you are looking for evidence to support the common sense ideas that sleep and exercise will improve your mood. I didn't feel I had gained anything from reading this book. The ideas in the book can be summed up as: DON'T eat sugar, drink coffee, smoke, etc. DO exercise, eat healthy, etc. Nothing Earth shattering there.The author does provide lots of research and anecdotal evidence to support his claims, but I would compare this book to one written about how to control stress that covered the obvious things like not procrastinating, finding a balance between home and work, etc.Overall a disappointment.