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The human body is not like a machine that works with a fixed number for everyone. For example, an athlete's need for water in the summer is completely different from someone who is sedentary and lives in a cool climate. So the recommendation to drink 8 glasses is more of a general simplification, not a precise scientific prescription.
Is there scientific evidence to support drinking 8 glasses of water a day?
The human body is not like a machine that works with a fixed number for everyone. For example, an athlete's need for water in the summer is completely different from someone who is sedentary and lives in a cool climate. So the recommendation to drink 8 glasses is more of a general simplification, not a precise scientific prescription.