It's really down to physics. Pressurised cabins on aeroplanes are having an effect on the air inside you, so as the cabin pressure decreases, the air inside the bowel expands by up to 30% more than usual, and that needs to get out.
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As for the farting, that's because of the change in cabin pressure and the gas in your system reacting accordingly – so be careful as the plane climbs and descends.
The altitude can cause dehydration in your digestive tract, and when you couple that with the tissues in your organs losing water throughout the flight, you will land feeling bloated and crummy – and likely be constipated when you get to where you're going.
Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.
On the morning of your flight, take a cup of hot water and some lemon and squeeze it in, she said. Celery, though not everyone's cup of tea, is the key ingredient. I know it looks so gross, celery, but believe me it is the best thing. I always mix it up with some cucumber and some lemon.
You may feel discomfort and notice minor swelling in your abdomen area as well. Luckily jet belly shouldn't last more than one week after you land and can be relieved using different techniques and by taking natural supplements.
Eat Light. Contrary to popular belief, flying on an empty stomach doesn't help you combat air sickness. In fact, an empty stomach actually exacerbates symptoms. Eat a light meal such as crackers, fruit, and other light snacks.
On long-haul flights, changes in cabin pressure during take-off and landing can lead to health problems. Air pressure in the cabin is lower than at sea level. As cabin pressure falls while flying, gas starts to expand. As a result, you may feel pressure in your stomach or digestive system.