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Alcohol

Shereen Rayle
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.

Soda

Shereen Rayle
Soda and other carbonated beverages can cause bloating. Those little air bubbles can expand in your stomach when the cabin pressure changes.

Water, Coffee & Tea

Shereen Rayle
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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