From the show's nutritionist, Dr. Jen's, blog on NBC.com:
Quote:
Last week, a viewer asked a question about the huge numbers that are sometimes posted on the Biggest Loser scale, and suggested that it is physically impossible to drop that much weight in one week (using the example of Jerry’s 31-pound weight loss at the end of week 1). This is both true and false. The numbers you see on the Biggest Loser scale are very real (I was there for the weigh-in and checked the accuracy of the scale!) -- but there are a few things to keep in mind. The scale reflects weight lost both as fat burned through exercise and dieting, AND as water weight lost. Fluid shifts can be immense, especially during the first weeks of a new lifestyle program, and this fluid loss explains part of the huge numbers seen. Also, a little behind-the-scenes secret: occasionally the production schedule of the show requires that a weigh-in is filmed actually 9 or even 10 days after the last one. This only happened a few times during filming, but can obviously give the contestants a few extra days of weight loss -- and the first weigh-in was one of these weeks. So no, Jerry did not burn off 31 pounds of fat in 7 days. A more realistic number for the typical viewer at home (if you cut your caloric intake by about 500 calories a day and exercise vigorously for about an hour a day) 1% of your body weight per week -- that would be about 1.5 pounds for a 150-pound person, 2 pounds for a 200-pound person, or 3 pounds for a 300 pound person.