If you step off a plane and feel awful, there is a reason for that. Apart from being cramped in a metal cylinder hurtling through the sky, you also lose an incredible amount of water from your body. In order to keep the cabin at a suitable temperature and oxygen level, airplanes basically turn into deserts, with no moisture in the air. This causes you to lose much more water, with people losing on average over 60 fluid ounces on a 10-hour flight.
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