Final answer:
Heavy physical activity increases water intake due to increased sweat and metabolic demands.
Explanation:
Heavy physical activity increases the human body's water intake due to several factors:
- Water is lost through increased sweat and respiration, necessitating higher water intake to maintain hydration levels.
- More water is necessary for increased metabolic demands during physical activity to support energy production and muscle function.
- Higher muscle mass increases the percentage of body water, requiring increased water intake to support muscle function and repair.
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