Do long flights cause dehydration?

Airplanes are controlled environments typically kept at only 10-20% humidity. This is far lower than the 35-65% humidity of normal everyday environments. Lower humidity in the air can lead to quicker dehydration.



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One of them, and it's a topic few people know that much about, is dehydration from air travel. Especially when you're on a long-haul flight to the other side of the world. People get dehydrated on flights more than say doing a lot of walking because of one thing: a lack of humidity.

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Hydrate, hydrate, hydrate. To combat this, start hydrating even before your trip, then during your travel day and after. If you're flying, drink at least 12 ounces of water every hour, recommends Jordan Crofton, a nurse practitioner and director of patient care at the Well.

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Dryness and air pressure changes can affect your ears, sinuses & taste. A 3 hour flight can shed up to 1.5 litres of water from the body. Aeroplane cabin humidity levels as low as 4% can cause the mucous membranes of your nose, mouth and throat to dry out.

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Think of it as a flying desert. Besides sleepiness, lack of fluid can make you confused or dizzy. Your head may throb. These are warning signals that your body needs attention.

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Jet lag is a temporary sleep disorder, but not temporary enough for many travelers. If you're flying from San Francisco to Rome for a 10-day trip, for example, it may take six to nine days to fully recover. That's because it can take up to a day for each time zone crossed for your body to adjust to the local time.

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Should you shower after getting off a plane? If you do happen to pick up bacteria or fungi that's not your own, this may lead to itchiness and bumps on the skin and scalp. Showering after flights is probably a good thing—regardless of the length! —if only to have that clean feel after being cooped up in a cabin.

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And while most people will be fine existing in a high-altitude environment for long periods, those who are sensitive may feel mild hypoxia or low oxygen in body tissues. This non-critical hypoxia may cause travelers to experience headaches and feel more tired.

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The team concluded that Pocari, or a similar substance, may offer better hydration than water during long-haul flights. The scientists added that other factors contribute to blood-clotting, and that passengers should take precautions when travelling for long periods of time.

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“While plain water is best for staying hydrated, other drinks and foods can help, too,” says Theunissen. “Fruit and vegetable juices, milk and herbal teas add to the amount of water you get each day.” Consider bringing your own herbal tea bags while flying.

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The cramped conditions and long periods of being less active on a flight can cause pain, stiffness or swelling of your legs. Being less active can lead to slow blood flow in your veins which increases your risk of developing a blood clot, known as deep vein thrombosis (DVT). DVTs most commonly form in the legs.

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Airplane cabins have very low humidity levels. To counteract the dryness, the general rule of thumb is to drink 8 ounces of water per hour (alternating with electrolyte-filled fluids)?. Koncilja further advises travelers to avoid diuretics such as coffee and alcohol in-flight.

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How to aid recovery from long-haul flights
  1. Avoid alcohol for at least 24 hours.
  2. Go for a short burst of cardio. ...
  3. Keep drinking water.
  4. Sleep, or if you can't sleep, rest in a darkened room very soon after arriving at your final destination.
  5. And finally, if you can, get a massage within the first 24 hours of landing.


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It is widely acknowledged that jet lag is worse when travelling east, but this has nothing to do with the direction of Earth's rotation. Like many creatures, humans have a circadian rhythm that follows a 24-hour period and is kept in sync by the eyes' response to natural light levels over the day.

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