As an expert in the field of human physiology and survival, I can provide you with an informed response to your question.

The human body is made up of approximately 60% water, which is crucial for various bodily functions, including digestion, circulation, and temperature regulation. While water is vital for survival, the body also requires nutrients from food to sustain life. Without food, the body can survive for a much shorter period than without water.

The length of time a person can survive on water alone depends on various factors, including the individual's health, size, activity level, and environmental conditions. On average, a person can survive for about three days without water, although this can vary. However, without any water intake, survival time can be drastically reduced to as little as a few hours in extreme conditions.

In contrast, the record for surviving without food is much longer. The longest recorded fast, under medical supervision, is 382 days. However, this person was still consuming water and small amounts of multivitamins. It's important to note that fasting for such an extended period can lead to severe health complications and is not recommended.

In summary, while the human body can survive for weeks without food, it cannot go more than a few days without water. The key to survival is maintaining hydration, and it's always best to consult with a healthcare professional before undertaking any fasting or dietary restrictions.

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Your average Joe/Jane, weight-wise, has enough fat reserves to live for four to six weeks without food. After that, the body begins to use its protein reserves (basically, the body itself). Body proteins are used up at a much faster rate than fat, and you could really only get another two to three weeks out of protein.read more >>