Can Your Nose Change What You Taste? A Jelly Bean Experiment (and the Tongue Map Myth)

Pinch your nose and eat a jelly bean. For a moment, it’s just sweet. Let go, and the flavour arrives. It’s a quick, surprising demo of how much of “taste” is really smell.

The experiment

Question: How much does smell contribute to flavour?

You need: jelly beans in at least four flavours (from a bag with no nut warning, and check for allergies), apple and potato cubes, small paper cups and napkins.

Allergy check first. Never run a tasting activity without checking for food allergies and getting permission, and offer a non-food alternative.

Predict: can you tell flavours with your nose pinched?
Students close their eyes, pinch their noses, and a partner hands them one jelly bean. They chew and guess the flavour.
Record the guess. Then they release their noses and say what they notice.
Repeat with apple and potato cubes. Can you tell them apart without smell?
Compare results across the class: how many got it right with nose pinched, and how many with nose open?

What usually happens

With the nose pinched, most people notice sweetness, sourness or bitterness but struggle to name the flavour. Apple and potato cubes feel similar: both are crunchy, and an apple’s sweetness may be the only difference. When noses open, the flavour comes through.

The science

Your tongue detects a small set of basic tastes: sweet, sour, salty, bitter and umami (savoury). Your nose detects thousands of smells. When you chew, odour molecules travel from the back of your mouth up to the smell sensors in your nose. Your brain combines taste, smell, texture and even sight and sound into one experience we call flavour.

That’s also why food tastes dull when you have a cold: a blocked nose cuts off the smell.

The tongue map myth

You may have seen a diagram that shows the tongue divided into zones: sweet at the tip, bitter at the back. It’s a myth, based on a misreading of old research. All the basic tastes can be detected across the tongue. You can test it: put a little sugar water on different parts of the tongue and see.

Questions to discuss

Why might it help animals to link smell and taste?
Why do food companies care so much about smell?
Why does your favourite food seem bland when you’re stuffed up?

The full activity is Can your nose change what you taste? from Your Senses: How Does Your Body Know?, which also asks Where is your skin most sensitive?, Why do you have two eyes? and How do animals sense what we can’t? Sign up for three lessons free.