Caloric Deficits *2
However, our resting metabolism is typically very low and therefore for 99% of the people who eat regular meals, their calorie intake will far exceed that resting metabolic expenditure. This of course leads to weight gain.
Studies have shown that 3500 calories equates to about 1lb of fat. It's a tedious process involving burning fat to raise the temperature of water by 1 degree but we'll leave that for another time..