The 4-Hour Body by Tim Ferriss - Official Site

The Hacker's Diet Dieting as an engineering problem[edit] Walker describes the diet as approaching weight loss "as an engineering problem",[2] claiming that his approach enabled him to reduce his weight from 215 pounds to 145 pounds in a year, and keep it stable afterwards.[3] Walker considers the problem of weight loss and maintenance as a control system problem. Simplifying the problem to the barest elements, he models the human body as a "rubber bag," where variables such as food type, frequency, metabolic rates and even exercise as considered negligible. According to Walker, the difference between calorie intake and expenditure is the key (a calorie surplus leads to weight gain; a calorie deficit leads to weight loss). To solve the problem, one needs to monitor calorie intake and weight loss rate, and make the desired proportional adjustments to reach the desired goal.[4] The body as a system[edit] Tools[edit] Exercise[edit] Walker says "You don't exercise to lose weight (although it certainly helps).