You can dehydrate by doing nothing!

Breathing. Several cups of water a day are lost by just breathing. Even while sitting on your couch doing nothing, you are losing moisture.

Not hydrating

Lungs need moist air to do their job. When exposed to warm, dry air more water is lost –especially in wintertime when you can lose 2 to 3 cups of water because the air is at its driest.

The body must moisturize the air before it reaches the lungs, which it does via mucous. When fluids decrease, mucous linings become drier causing the lungs to become more sensitive to irritants like dust, smoke, mold, and Rosie O’Donnell. The result is a dry, hacking cough like the one your obnoxious uncle makes.