Why does food taste different on an airplane?

Sometime around the three-hour mark, somewhere over the Atlantic, it happens: The flight attendant asks what you’d like to drink, and you hear yourself say, “Tomato juice, please.” Tomato juice. Which you’ve never ordered on the ground. Not even at a fancy brunch restaurant with freshly squeezed juices on the menu.

Welcome aboard. Your sense of taste has left the building.

What’s actually happening up there

A lot changes when you’re flying—and your body goes along with it without being asked. The air pressure in the cabin is significantly lower than on the ground, comparable to being at an altitude of around 2,000 to 2,500 meters. At the same time, the cabin air is extremely dry—drier than most deserts. Anyone who has ever woken up with a sore throat after a long-haul flight knows exactly what we’re talking about.

This combination of dry, pressurized air directly affects your senses. Studies—including a well-known study by the Fraunhofer Society commissioned by Lufthansa—show that your sense of taste for sweet and salty flavors can diminish by up to 30 percent on an airplane. Your sense of smell, which is responsible for a large part of the taste experience, also works at a reduced capacity. Savory and bitter notes, on the other hand, come through surprisingly well.

In practical terms, this means: A dish that is perfectly seasoned on the ground suddenly seems bland and lackluster at 10,000 meters—like a concert where someone has secretly turned down the bass and treble.

And that explains the tomato juice

Tomato juice is naturally an umami bomb—savory, slightly tart, and complex. These are precisely the flavors that remain clearly perceptible even at high altitudes. What might seem too intense on the ground strikes just the right note on a plane. Lufthansa has analyzed this, by the way: about 1.8 million liters of tomato juice are served on board each year—roughly the same amount as beer. On the ground, this ratio wouldn’t occur to anyone.

What airlines do about it (and why in-flight meals are still often… well, you know)

Airlines are aware of this effect—and season their in-flight meals more heavily as a result. They also make heavy use of umami: MSG, mushrooms, and aged cheese. That sounds like a sophisticated plan, but it has its limits. Because on top of the dryness, there’s another problem: the food is precooked on the ground, frozen, transported, and reheated in the air—all in an onboard galley whose basic setup resembles a school locker. This makes Michelin-star-level cuisine structurally difficult.

So here’s what you can eat and drink: anything savory works surprisingly well. Tomato juice, of course. And if you’re reaching for wine, red wine often performs better on a plane than expected—umami plays a role here, too.

The next time you order tomato juice

You haven’t been transformed. Nor have you suddenly become a different person. Your brain is simply making the best of what the cabin has to offer under unusual conditions. And sporadically that just happens to be tomato juice.

Bon appétit—at whatever altitude.