In case of fasting, glycogen stores in the body can last up to:
Liver glycogen is the first-line of defence against hypoglycemia. The liver concentration of glycogen is about 450 mmol /L glucose equivalents after a meal, falling to about 200 mmol /L after an overnight fast. After 12 to 18 hours of fasting, liver glycogen is almost totally depleted.
7 days
72-96 hours
6-8 hours
12-18 hours
Fuel in Fed, Fasting and Starvation