Sources of energy in calories available for a person of 70 Kg

A normal adult requires around 2000 calories everyday.

1) Triglycerides in adipose tissue: 13Kg= 120000 Cal
2) Triglycerides in liver: 50gm= 450 Cal
3) Triglycerides in muscles: 300gm= 2700 Cal
4) Glycogen (made up of glucose) in liver: 100gm= 400 Cal
5) Glycogen in muscles: 500gm= 2000 Cal
6) Glucose in blood: 15gm=60 Cal

It means that if a person drinks only water, he can survive for 60 days without any food!