" Next was learning that 4,000 calories equals about a pound of fat. I know that’s an oversimplification, but that’s okay. Oversimplifying is one of the next things I’ll mention as a tool. But if 4,000 is roughly a pound of fat, and my BMR makes it pretty easy to shave off some huge number of calories per day, it suddenly becomes very clear how to lose lots of weight without even doing any exercise. Add in some calculations on how many calories you burn doing, say, 30 minutes of exercise and you can pretty quickly come up with a formula that looks something like: BMR = 2,900 Actual intake = 1,800 Deficit from diet = BMR – actual intake = 1,100 Burned from 30 minutes cardio = 500 Total deficit = deficit from diet – burned from 30 minutes cardio = 1,600 "

― Timothy Ferriss , The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman