For how many days can a person survive without food?
On average, a human can live for up to 3 weeks without food due to energy stored in the body.
Glucose provides all our cells with energy, but glucose is only found inside of cells. When we need energy, it will either be drawn from the liver stores (glycogen) or from external sources (food). One of the primary functions of insulin in the body is to regulate glucose levels by directing it into different cell types.