Airplane Food Conspiracy

Have you ever eaten food during a flight and noticed how different it tastes? For example, a regular sandwich might taste perfectly fine on the ground, but in the air, that same sandwich can seem bland or unappetizing. Often, we blame the airlines or catering services for serving tasteless food. But from a scientific perspective, the change in taste isn’t entirely their fault. Today, we’ll explore why food tastes different while flying.

To get to the main point—our taste perception changes while we’re in flight. But why does this happen? Taste relies on both our sense of smell and taste buds. When a flight reaches cruising altitude, both senses are affected, which impacts our perception of saltiness and sweetness within a pressurized cabin.

As the airplane climbs, the air pressure decreases, and the humidity inside the cabin drops rapidly. This reduces blood oxygen levels, which affects our olfactory receptors—the parts of the nervous system responsible for smell—making them less sensitive. At cruising altitude, cabin humidity can drop to less than 12%, which is drier than most deserts. Interestingly, only the sensations of sweetness and saltiness are affected by this environment; flavors like bitterness, sourness, and spiciness remain largely unchanged. Because 80% of taste comes from smell, the dryness in the cabin means our odor receptors don’t work as well, which diminishes our sense of taste.

In addition to these changes, temperature and air pressure fluctuate significantly. We might think of these shifts as the "magic" behind weather events like rain, wind, and sun, which all affect our activities on the ground. Similarly, environmental factors like pressure and humidity impact us at cruising altitudes.

Although we usually think that flavor is determined by our tongue and nose, research suggests that our ears might also play a role. According to one study, people who ate in a quiet setting found their food tasted sweeter and less salty than those eating with loud background noise. Interestingly, foods also seemed crunchier to people eating in a noisy environment.

To address these challenges, airlines and catering services adapt their recipes. Many use naturally intense flavors from ingredients like certain fruits, vegetable oils, and concentrates to reduce the need for added salt.

Here’s a fun fact: the "umami" flavor remains unaffected by altitude, and loud background noise can even enhance it. This is why many people order tomato juice or Bloody Marys in-flight, as tomatoes are rich in umami.