that whenever i lift didn't have there's laws to the way that the body burns energy just physical laws to how the body burns energy and there's no exception to these rules the first one is if you have glucose in your bloodstream your body will burn glucose first when you're out of glucose you go to your backup reserve of energy which is called glycogen you have about a twenty minute reserve of glycogen so you're exercising intensely in a fasted state you've got no glucose you've got twenty minutes ago like

after your glycogen has gone we'd love to think that the body goes right to burning fat but that's not true takes five to six hours to mobilize metabolize fat it takes three minutes to mobilize lean muscle tissue so where do you think if you're exercising intensely in a fasted state where do you think you're getting energy you're burning your own lean muscle