Why is drinking water important at higher altitudes?

• A. The body dehydrates quicker because you are breathing so much dry air.
• B. Water helps you acclimate faster.
• C. Hydration prevents frostbite.
• D. Hydration is necessary for oxygen transport.

Answer: (A)

At higher altitudes the air is dry and you breathe more to take in enough oxygen, so you lose more water through your lungs. That increased fluid loss means dehydration can sneak up quickly, making drinking water essential to stay hydrated and maintain overall performance and safety. The idea that hydration speeds acclimation isn’t the main mechanism—acclimatization involves broader physiological changes like adjustments in ventilation and blood chemistry. Frostbite is a cold exposure issue, not a hydration one, and while hydration supports blood volume, it’s not the primary reason you need water at altitude.