AutoDesk founder and eccentric genius John Walker has a free ebook called The Hacker’s Diet.
The Hacker’s Diet … is a serious book about how to lose weight and permanently maintain whatever weight you desire. It treats dieting and weight control from an engineering and management standpoint, and provides the tools and an understanding of why they work and how to use them that permit the reader to gain control of their own weight. The book is intended primarily for busy, successful engineers, programmers, and managers who have struggled unsuccessfully in the past to lose weight and avoid re-gaining it.
Link (via Cool Tools)