Why should I drink eight to nine cups of water a day?

Ronald Tamler, MD
Endocrinology Diabetes & Metabolism

The average urine output for adults is about 1.5 liters (6.3 cups) a day. You lose close to an additional liter (about four cups) of water a day through breathing, sweating and bowel movements. Water drinkers average 75 to 90 fewer calories at each meal, which greatly aids in weight loss and weight control. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.