> A pound of fat is about 6000 calories. Where did you get that number from? Pure fat is approximately 9 calories per gram, which is 9000 calories per kilogra

> A pound of fat is about 6000 calories. Where did you get that number from? Pure fat is approximately 9 calories per gram, which is 9000 calories per kilogram or ~4090 calories per pound. Body fat is around 87% pure fat, meaning a pound of body fat is roughly 3600 calories. Thus, the necessary deficit for 10 pounds in two weeks is about 2571. Still pretty high, but well under Olympic training levels.