Go ahead, put your body under severe stress for no reason retard
Acting like fat people have 0 muscles lol
And no, your body will use muscles regardless of whether your stored fat has ran out (which it never will you retard, because it's a severe health risk and could put you in the ER) because muscles give you more energy compared to stored fat
@AsianBossLT don't do it, let him suffer alone and age himself faster