You have at least 40,000 calories’ worth of fat on your body right now, but only 2,000 calories’ worth of sugar. If you’re a fat-burner, when you start fasting, your body simply continues to use fat as its primary fuel. If you’re a sugar-burner, though, your body burns those 2,000 calories of sugar until it’s all gone, and then it triggers hunger until it’s adapted to using fat.
