Our ability to perceive taste is affected by few factors such as humidity, air pressure etc., In an airplane, the humidity is less as compared to the ground. This makes the air in the airplane quite dry. And also, to maintain the air pressure inside and outside the airplane, the air pressure inside the plane is decreased. Therefore the decreased air pressure and dry air dries our nose and mouth. Dry nose cannot properly smell the odors. Dry mouth reduces the sensitivity of our taste buds. As a result, we cannot perceive the taste of the food properly.
Excellent explain very good.
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