In addition, cabin air is very dry, so the likelihood is that you will be a bit dehydrated (more so if it's a long flight). This can result in a case of constipation and bloating which will add a couple of pounds on the scale.
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Why do I gain weight flying? All those pounds are mostly water weight. The reason for the five-pound “gain” is water retention.
Refinery29 also reported that eating more carbs than usual, eating saltier foods, and traveling to warmer climates — all things that may happen on vacation — can make the body automatically retain extra water. This makes the number on the scale go up, even though your body mass doesn't actually change.
Travel: For some people, sitting for a long time in a car or airplane can cause fluid retention. The lack of circulation allows fluid to build up; however, the swelling usually goes away in a day or two.
Once you've landed, you can use a lot of the same tools to reduce swelling after your travel: “Stay hydrated, move around, and wear compression socks,” says Wurster. “Also, be mindful of what you're eating and avoid foods too high in sodium because that can also add to further swelling.”
Take a trip to the grocery store as soon as possible and stock up on foods that help you lose weight. Such foods include, but are not limited to, whole grains, fresh fruits and vegetables, legumes -- such as chickpeas and lentils -- and lean proteins. Avoid sugary and salty snacks altogether.
However, the pressure in the cabin caused by being at such a high altitude makes any air trapped in your gut expand, which causes you to feel bloated after a flight.
Sitting down in a tight seat for 13+ hours can sometimes lead to circulation issues, including swelling in the feet. According to The Healthy, the chance of your body forming blood clots increases when blood isn't moving correctly, such as when onboard a long-haul flight.
Travel: For some people, sitting for a long time in a car or airplane can cause fluid retention. The lack of circulation allows fluid to build up; however, the swelling usually goes away in a day or two.
POST-FLIGHT SKINCAREEvery night, apply three thin layers of natural yogurt to your face (allowing each layer to dry completely between applications) for 10 weeks. Leave the final layer of yogurt on your skin for 10-20 minutes and then remove it with warm water.