Want to lose weight, but aren't sure how the math works behind burning calories and fat? Here's how to lose weight based on the mathematics of burning calories, burning fat, and weight loss. Dr. Carson Chow explains what happens behind the scenes when you exercise and go on a diet to limit food and calorie consumption. The old rule of burning 3,500 calories to lose 1 pound doesn't actually work in the long-run. Dr. Carson Chow explains a new rule for burning fat and calories and losing weight.