If you burn 500 more calories than you eat every day for a week, you should lose about 1-2 pounds.

If you want to lose weight faster, you'll need to eat less and exercise more.

For instance, if you take in 1,050 to 1,200 calories a day, and exercise for one hour per day, you could lose 3-5 pounds in the first week, or more if you weigh more than 250 pounds. It's very important not to cut calories any further -- that's dangerous.

Limiting salt and starches may also mean losing more weight at first -- but that's mostly fluids, not fat.

'When you reduce sodium and cut starches, you reduce fluids and fluid retention, which can result in up to 5 pounds of fluid loss when you get started,' says Michael Dansinger, MD, of NBC's The Biggest Loser show.