I drink water when I'm exercising, but the rest of the time I depend mostly on coffee, tea and diet sodas. My sister keeps warning me that I'm going to get sick. Unfortunately, in America, we tend to forego those opportunities more than we should, and a lot of us walk around in a state of mild dehydration. This fluid loss is significant enough to affect your body's internal thermostat. That recycled air is very dry.
Water is our essence, our very lifeblood, the most important nutrient in our body.
When we fail to replenish the losses, we set up a physiological chain reaction. To prevent dehydration, experts recommend that everyone drink six to eight glasses of water a day. But even Grandjean admits that determining water intake is not an exact science. There are variations in individual needs and variations in diets.