Should you drink before a long flight?

If you are going on a long flight, it is best to think about hydration in advance. “At high altitudes, air is dryer and the oxygen content is lower. This is why, for every hour on a plane, you should drink 0.2 to 0.4 litres of water,” says Anamaría Teino, a doctor at Mehiläinen specialising in travel medicine.



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“The main issues are with the side effects of drinking in general, coupled with some of the side effects of flying,” says Jo. “For example, traveling by air is a dehydrating experience, and so is drinking alcohol, so you are even more likely to suffer the effects of dehydration.

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Stay hydrated Many seasoned travellers say the single most important thing to do on a long-haul flight is to drink water, because flying is the ultimate dehydrator. Try hydrating before you fly with a litre of water, then aim for at least 1 litre every 5 hours on board.

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All drinks with sugar, caffeine, or alcohol should be avoided to limit dehydration, and water should be the only drink choice during flights. But if water doesn't cut it, here's what Sauza said you should drink on your next flight.

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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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“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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Top 5 travel tips to help you prepare for a long-haul flight
  1. Wear comfortable clothing. ...
  2. Stay hydrated. ...
  3. Exercise before you fly. ...
  4. Eat nutritious food. ...
  5. Practice meditation and yoga.


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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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Some people drink to calm nerves or help sleep on planes—can this help? “What is more important is figuring out what can actually help nerves—and there are much better alternatives to booze,” Jo tells us.

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FAA requires 8 hours from bottle to throttle. Some company rules are more restrictive. 10 or 12 hours before any assigned duty is common. If I'm on call the next day then I have to stop drinking 10 hours before my reserve time starts.

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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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Drink lots of water: Nervous flyers should drink lots of water before and during their travels to help them stay hydrated and relaxed until their plane finally touches down.

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Although coffee is one of the most common drinks offered or purchased onboard, it should be avoided, as caffeine disrupts sleep. The same applies to alcoholic beverages. It's okay to accompany your dinner with a can of beer or a glass of wine. However, think about your plans for the rest of the flight.

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Deep breathing is known to trigger a comfort response and will help prevent hyperventilation. Reading a book or listening to a good podcast can refocus your mind and attention. Distracting yourself from the fact that you are flying can be a great way to keep calm if you're a nervous flyer..

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How to survive a long-haul flight: 10 proven tips
  1. Find comfortable clothes to wear on long flights. ...
  2. Reserve a good seat. ...
  3. Prepare yourself for sleep. ...
  4. Don't pack too much in your cabin luggage. ...
  5. Take your own snacks. ...
  6. Move around the plane. ...
  7. Stay hydrated. ...
  8. Relax!


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Avoid eating heavy foods, especially spicy foods and foods that you wouldn't even normally eat. Eating something that could really upset your stomach, or give you something worse like food poisoning, isn't fun. It's best to eat healthy foods even if it's just 24 hours before your trip, this could help a lot!

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How to survive a long-haul flight: 10 proven tips
  1. Find comfortable clothes to wear on long flights. ...
  2. Reserve a good seat. ...
  3. Prepare yourself for sleep. ...
  4. Don't pack too much in your cabin luggage. ...
  5. Take your own snacks. ...
  6. Move around the plane. ...
  7. Stay hydrated. ...
  8. Relax!


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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 Ultimate In-Flight Hydration Hack
Deep and sustained hydration requires electrolytes. To keep your mineral levels, water levels, and energy levels on the up-and-up, our favorite in-flight wellness hack of all time includes packing LMNT stick packs into every carry-on.

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Keyes said those kinds of incidents are “rare but not unheard of,” with at least a few reports each year of intoxicated pilots being kept from flying. Airlines also have programs to encourage pilots to voluntarily get treatment in cases of alcoholism, he added.

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