Originally Posted by
jzbob81
Not quite true either.
That really depends in which "gear" your body is at the time. If you are doing low intensity workout your body will (after depletion of glycogen) use mainly fat as energy source.
But if you're doing high intensity workout your body will tear down muscle mass as it can obtain energy from muscle tissue much faster than from fat.
You are correct in that after hours of high intensity exercise your body's ability to keep up using fat stores will fail. The fat stores are really more for hibernating than hunting
