Tag: 21 hour fast

After 21 hours of fasting, the body has typically depleted its primary glucose stores and entered a deeper fasted state, shifting its metabolism to burn fat for fuel and triggering cellular repair processes. This metabolic switch from relying on glucose to producing ketone bodies is a key physiological change that occurs at this stage.

After approximately 12-16 hours of fasting, your body typically depletes its glycogen stores and transitions into a fat-burning state. But what happens to your body after 21 hours of fasting, a duration that pushes metabolic changes even further? This is the stage where you enter a deeper phase of cellular renewal and ketosis.