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I'm assuming that your question is about why people can abstain from food but not water for an extended period of time. The reason for this is that your body is about 70% water and you need water to operate even on the cellular level. Your body also needs energy, which you get from food. However, your body can store energy and run off of stored energy (usually fats) for a very long time, but the human body does not store excess water for long peiods of time.

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Q: Why can people abstain from food but water for an extended period of time?
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