You lose up to 30 percent of your taste buds during flight.   

You lose up to 30 percent of your taste buds during flight.

The combination of dryness and low pressure reduces the sensitivity of your taste buds to sweet and salty foods by around 30%, according to a 2010 study conducted by Germany's Fraunhofer Institute for Building Physics, commissioned by German airline Lufthansa.To investigate this the researchers used a special lab that reduced air pressure  simulating cruising at 35,000 feet (10.6km) – as well as sucking moisture out of the air and simulating the engine noise. It even made seats vibrate in its attempts to mimic an in-flight meal experience. 

This might explain why airplane food gets such a bad reputation. The elevation in an airplane can have a detrimental effect on our ability to taste things. According to a 2010 study conducted by Germany's Fraunhofer Institute for Building Physics, the dryness experienced at a high elevation as well as low pressure reduces the sensitivity of a person’s taste buds to sweet and salty foods by about 30 percent. Add that dry cabin air affects our ability to smell, and our ability to taste is reduced further.