Alcohol is dehydrating and when compounded with flying, it's even more so and contributes to jet lag and feeling terrible once you touch down. Aside from that, alcohol is more potent on all levels at high altitudes.
Broccoli and cabbages are good for you, but they also cause bloating, which will become up to 30% worse when traveling, making your small airplane seat feel even smaller.
Garlic is wonderful for you, but when you're in close proximity to a bunch of other people, it's best to avoid, as that smell literally sweats out of your body.
Not your best friends even at home, beans can cause even more gas when flying. Try soaking the beans overnight to break down the problem sugars before cooking them or just skip eating them altogether before a flight.
Soda and other carbonated beverages can cause bloating. Those little air bubbles can expand in your stomach when the cabin pressure changes.
The water tanks on planes are notoriously hard to clean and can harbor bacteria like e-coli. Either bring your own beverage onboard, get a juice or only accept water if it is served to you in a sealed bottle.
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