What is the main source of glucose in your body after several days of fasting?

Answer 1

First two are wrong... Mick's absolutely right. Glucose does not and cannot come from fat. It comes from either ingested food (carbs/sugar) or stored glycogen... period. Fat metabolism is a whole 'nother ballgame and doesn't involve glucose in any way.

Answer 2

Your liver stores glucose in the form of glycogen which gets released when your blood sugar level is low. (Your pancreas' alpha cells actually release glucagon which stimulates your liver to give up it's store of glycogen.)

When your liver's glycogen stores are diminished, your body will go on to utilise fat reserves. This will, before long, amount to you developing ketoacidosis ... improper fat metabolism ... which can often be smelled on your breath as acetone (nail varnish remover). Your blood also tends to become more acidic.

Answer 3

Fat if you have it...if not, then muscle.

Answer 4

stored fat