During fasting, complex metabolic processes occur, including the mobilization of liver glycogen, degradation of triglycerides, and muscle protein breakdown.

“you have dedicated nutrients stores you have glycogen and your liver that's mobilized and that's a dumping glucose into the bloodstream you have laid out a post issue that starts degrading your triglycerides and then you end up with glycerol and fatty acids in the bloodstream which then you know are taken up by the liver and so forth so you have all these you know if you're really without nutrients for a long time then your muscle proteins start being degraded which is probably undesirable that's dumping amino acids into the circulation so that you can maintain your survival”