When we lose weight, where does the lost weight go?

After weeks of trimming a few calories here, exercising a little more there, you put on a pair of jeans, and like magic, the waist has grown. You button them up to behold a welcome space between your belly and the fabric. How did that happen?

With 66 percent of the adult American population either overweight or obese [source: Centers for Disease Control and Prevention], a lot of people are… » Full Story on HowStuffWorks