Why can you live longer without food than without water?

Humans can survive for several weeks without food due to the body's ability to utilize stored energy reserves, such as fat and muscle. In contrast, water is essential for nearly every physiological process, including temperature regulation, digestion, and circulation. Dehydration can lead to severe health issues and can be fatal within just a few days, as the body cannot function without adequate fluid levels. This fundamental difference in the body's reliance on food versus water explains why survival without food is feasible for longer periods.