How to Lose Hundreds of Pounds

"In June of 1965, a 27-year-old gentleman by the name of Angus Barbieri checked himself into the Maryfield Hospital in Dundee, Scotland. His complaint was that he had become "grossly obese." Upon admission, the young man weighed in at 456 lbs (207 kg). Barbieri’s doctors recommended a brief period of fasting, presumably in the hope that his stomach would shrink, reducing his appetite and his capacity for food. But at the end of the scheduled fast Barbieri was having no trouble starving himself, so he elected to continue in a supervised fashion.

...contrary to intuition, over 90% of lost weight leaves the body as carbon dioxide exhaled from the lungs, disappearing into thin air. The remainder is excreted in urine, sweat, and other bodily fluids."