Travel can reduce hydration through long flights in pressurized cabins, increased walking, and alcohol consumption. Early dehydration symptoms may resemble jet lag, tiredness, food sensitivity, and altitude effects. In hot climates, the body works to maintain core temperature around 37°C by triggering sweating. When external temperatures rise above about 25°C, the hypothalamus signals glands to release sweat, which helps regulate temperature but also increases fluid and mineral loss. Without replacing lost fluids and electrolytes, dehydration can become more noticeable over several days, affecting skin, causing headaches, and leading to exhaustion. Regular water intake may be insufficient in heat because minerals are lost faster than usual.
"Many aspects of traveling reduce overall hydration, starting with spending hours in a pressurized cabin with a limited amount of oxygen and hundreds of other people. Once you arrive at your destination, there's usually an increase in walking and, for many, alcohol consumption, both of which strip moisture from the body. The symptoms can be misleading, though. "A lot of people mistake early dehydration for other travel ailments such as tiredness, food sensitivity, and altitude effects," says Rayan Mohammed, MD and general practitioner at Valeo Health in Dubai."
"It's an all-too-familiar feeling. You spend the first day of your sun-drenched, flip-flop-wearing vacation feeling dry, foggy, and tired. Jet lag, you assume. But in reality, it's the first signs of dehydration setting in after the flight and sudden heat exposure has begun to soak up your body's natural moisture. Get to day three of your trip, and if you haven't been replacing the lost fluids and electrolytes, the dehydration is now beginning to show up in your skin, never mind the dull headache and a general sense of exhaustion."
Read at Conde Nast Traveler
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