When you stop eating, your body first burns through glycogen and then shifts to fat for fuel, releasing ketone bodies to keep your brain functioning while hunger hormones like ghrelin spike around your usual mealtimes. As the fast progresses, autophagy kicks in, clearing damaged cells and boosting immunity—but after several days, the benefits give way to muscle loss and nutrient deficiencies that threaten your health. Let’s watch the video to uncover exactly how these processes unfold step by step…