How do you prevent dehydration on a long flight?

Drink plenty of water The general rule is to drink little and often. Before you even step on board a plane, you should carry a large bottle of water with you. Sure, you can ask for water from the flight attendants. But, it's more convenient to have your own supply for the duration of your flight.



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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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According to Bacheler, the human body loses about 8 ounces of water per hour on an aircraft at altitude, mostly from breathing. As such, the Aerospace Medical Association (AsMA) recommends drinking about 0.25 liters (or 8 ounces) of water per hour while on an airplane.

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Before you leave home, drink beverages that are high in electrolytes, typically those used by athletes. These include Gatorade, Powerade and Lucozade. Resource Water is another good example as it has water and electrolytes.

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It's a list of four things you definitely should NOT eat or drink right before hopping on a plane . . .
  • Salty foods. It's common for people to get dehydrated on planes, thanks to the dry air in the cabin. ...
  • Carbonated beverages. ...
  • Alcohol. ...
  • Coffee.


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According to Bacheler, the human body loses about 8 ounces of water per hour on an aircraft at altitude, mostly from breathing. As such, the Aerospace Medical Association (AsMA) recommends drinking about 0.25 liters (or 8 ounces) of water per hour while on an airplane.

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Up your electrolyte intake An electrolyte imbalance can lead to muscle cramping, headaches, and sleep issues, making jet lag symptoms worse. Taking an electrolyte supplement such as SaltStick Caps or FastChews before, during, and after a flight, along with drinking water, can be very helpful in maintaining the balance.

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“Probably the best thing you can do before (and during) your flight is drink water,” says Aviva Rubin, MS, RDN. “Water prevents dehydration and reduces jet lag while keeping you from feeling lethargic.” Keeping yourself sufficiently hydrated is a simple way to get your flight off on the right foot.

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As a caveat, she noted that drinks with too much acid (such as tomato juice or citrus juice) can result in an upset stomach or heartburn if you're susceptible to these issues. Grosskopf said that a bloody mary, gin and tonic, Moscow mule, and a mimosa are all “safe bets” on flights.

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13 Tips for Surviving a Long-Haul Flight
  1. Choose your seat. ...
  2. Power up. ...
  3. Get comfy. ...
  4. Bring some snacks. ...
  5. Always bring a scarf or shawl. ...
  6. Pack a pillow and blanket. ...
  7. See no evil, hear no evil. ...
  8. Hydrate, hydrate, hydrate.


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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.

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