After building Autodesk into a Fortune 1000 company hacker John Walker decided to do something about his life long weight problem. Looking at fat loss as an engineering problem Walker went from 215 to 145 pounds within a year and he has kept all of the excess weight off since then. He has published his techniques in the free online book "The Hacker's Diet". He also has free tools based on his ideas rendered in microsoft Excel and in PalmOS programs at his site.
An interesting overview of The Hacker's Diet on wikipedia:
The Hacker's Diet - Wikipedia, the free encyclopedia
The Hacker's Diet web site:
The Hacker's Diet
If you are on linux and can't get the spreadsheets from The Hacker's Diet to work in Open Office you can use this free ( as in LOW CALORIE beer ) online tool based on The Hacker's Diet( same thing ):
Physics Diet
The site above also has a support forum.
Other, related sites that you might find useful:
Digg - Jeremy Zawodny Loses 50 lbs Using Hackers Diet Digg - The Hacker's Diet