How long can you survive without food?

The body is built to ride out famine. With water, most people can survive weeks without food, drawing first on glucose, then fat, then muscle, and documented hunger strikes and medically supervised fasts have run well past a month, with Gandhi's famous fasts and modern cases both exceeding three weeks. The exact limit depends on starting body reserves, hydration, and conditions, which is why no responsible source gives a single hard number.

Water is the real countdown. Without it, survival drops to a few days, commonly cited around three, faster in heat or exertion, because you cannot store water the way you store fat and you lose it constantly through breath, sweat, and urine. This is the survival-priority order that rescuers teach: shelter and water outrank food dramatically in the short term. None of this is an endorsement of extended fasting without medical supervision, which carries real risks, including a dangerous refeeding reaction when eating resumes.