Flavour is a Symphony for the Senses
Before we dive into the specifics of travel, it's important to understand that what we call 'flavour' is a complex creation of the brain. It’s a multisensory experience that goes far beyond the five basic tastes of sweet, salty, sour, bitter, and umami
that our tongues detect. Our sense of smell is arguably the most critical component, contributing up to 80% of what we perceive as flavour. Think about how food tastes when you have a bad cold; with a blocked nose, everything seems bland. But it doesn’t stop there. The texture of food (touch), its appearance (sight), and even the sounds it makes as we eat all contribute to the final perception. This is why the constant drone of an engine and the rumble beneath your feet can have such a profound impact.
The Engine's Roar and Your Taste Buds
The loud, continuous background noise in an airplane cabin, typically around 85 decibels, is a major culprit in dulling your meal. Scientific studies have confirmed that this type of white noise significantly suppresses our ability to taste sweet and salty flavours. In a 2015 study from Cornell University, participants in a simulated loud cabin environment rated sweet tastes as less intense. This phenomenon might be linked to how our brains process sensory information. Some theories suggest that loud noise is a form of distraction, drawing cognitive resources away from focusing on taste. Another possibility is that the nerve that transmits taste signals from the tongue to the brain passes through the middle ear, and loud noise may physically interfere with its ability to send clear signals.
The Surprising Power of Umami
While noise dampens sweetness and saltiness, it has a surprisingly different effect on umami—the rich, savoury taste found in foods like tomatoes, mushrooms, and aged cheese. The same studies that showed a suppression of sweetness found that umami perception was actually enhanced by loud background noise. This helps explain a long-observed travel quirk: the popularity of tomato juice on flights. Many people who wouldn't normally drink it on the ground find themselves ordering it in the air. Airlines have taken notice; some, like British Airways and Cathay Pacific, have even designed umami-rich menus and special 'sonic seasoning' playlists to make their food taste better at 30,000 feet.
Vibrations and Other Travel Woes
It's not just noise. The constant, low-frequency vibrations of a moving train or plane also play a role. While research in this specific area is less extensive than on noise, the principle of cross-modal perception suggests that this constant physical sensation can distract the brain and interfere with its interpretation of taste and smell signals, contributing to a duller flavour experience. For air travel, there are additional factors at play. The cabin's low humidity (often drier than the Sahara desert) dries out our nasal passages, directly impairing our sense of smell. Furthermore, the lower cabin pressure can slightly reduce blood oxygen saturation, which may numb taste bud sensitivity by up to 30%.
