We have all been there: you take a bite of your in-flight meal and it just tastes off. While it is easy to point the finger at the airline caterers, the true villain is the aircraft environment. The pressurized cabin at 35,000 feet dulls your taste buds and sense of smell, robbing your meal of its flavour.
Here is a look at the science that explains why your meal tastes different in the air.
Aircraft Cabin EnvironmentÂ
Eating on a plane is like dining on a high mountain peak. The low pressure and humidity inside the cabin suppress your ability to taste, making food seem bland. This sensory impairment is the main reason in-flight meals are prepared with more robust seasoning to taste normal.
Dry Air
We must also consider the cabin's exceptionally low humidity as a key culprit. This creates an environment more parched than most deserts, which attacks your senses. The arid cabin air dries out your nose, shutting down your ability to smell. Since smell is responsible for most of what we call "taste," your perception of flavor is profoundly weakened.
Diminishing Flavors Due To Reheating and Freezing
Chefs must overcome the immense logistical hurdles of in-flight service to deliver on the simple promise of a tasty meal. Food is prepared in massive catering facilities, where it is partially cooked ("par-cooked") and then chilled for safety. On the plane, it's reheated in convection ovens.Â
Unfortunately, the cooking, chilling, and then reheating take a toll on food, often diminishing its texture and flavor. This is why airlines like American Airlines favor pastas, curries, and braised meats, which reheat more reliably than delicate fish or leafy vegetables.
Less Oxygen In Your Blood
While airplanes cruise at 35,000 feet, the cabin is pressurized to feel more like you are on a mountain at 6,000-8,000 feet. At this altitude, your blood carries a little less oxygen, typically a drop of about 3-9% compared to sea level. This mild reduction doesn't make you sick, but it does affect your senses. One of the first to be dulled is your sense of smell, which is critical for tasting food. With aromas muted, flavors feel flatter, making your meal less exciting than it would taste on the ground.
Decrease In Saliva Formation
You can thank the desert-like cabin air for your bland meal. This dehydration leads to a dry mouth, and without saliva to dissolve and carry food particles to your taste buds, flavors simply can't be detected well. Those taste buds can't get a good "read" on the food, dramatically muting its flavor and turning a potentially delicious meal into a bland disappointment.
To deal with these, the catering companies have to resort to many tactics like:
The Culinary Countermeasure
Fighting back against the cabin's dulling effects requires a culinary counterattack. Recipes are engineered with nearly double the salt, sugar, and spices to compensate for muted taste buds. They specifically choose bold ingredients that can punch through the blandness Bold herbs, strong spices, and bright acidity from lemon or vinegar are specifically chosen to penetrate the palate's numbed state.
The Umami Advantage
Among the five basic tastes, umami has a distinct advantage in the high-altitude environment. Sourced from foods like Parmesan cheese, mushrooms, and soy sauce, this savory sensation is uniquely resilient to the dulling cabin environment and heightened by engine hum.Â
Recognising this, airlines deliberately design their menus around umami-rich flavors, opting for hearty tomato sauces and braised meats. The success of Korean Air's bibimbap, a dish famous for its strong umami, spice, and pungent flavors, is a perfect example of this strategy working.
Sonic Seasoning
Perhaps the most surprising factor is the engine's roar itself. This relentless 85-decibel hum is more than just background noise. Scientists found this "sonic seasoning" tricks your brain by muting sweetness and amplifying deep, savory flavors. The reason might lie in a nerve that connects your tongue to your brain by running right through your ear, where it's jostled by the vibrations. This is why a Bloody Mary or tomato juice tastes remarkably better in the air than it does on the ground.
Individual Perception
Does this mean everyone finds airplane food bland? Not exactly. Interestingly, many people find they enjoy a glass of wine just as much in the air as they do on the ground. So, while every passenger faces the same physical hurdles in the air, your own unique body and mindset, age, and how well-rested you are, ultimately shape your final verdict on that meal.
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