With out a Prepared supply of glucose and glycogen to pull from (which has been depleted during your fasted point out, and hasn’t nonetheless been replenished having a pre-workout food), The body is forced to adapt and pull from the source of Vitality that it does have obtainable: the Excess https://econopass.com/health-and-fitness/weight-loss-tips/popular-diets-pros-cons/intermittent-fasting/intermittent-fasting-for-weight-loss/