Taste and Smell Experiment Kids Can Do in 10 Minutes

The moment is the release. Your child is chewing a cube of something, nose pinched, reporting that it is “just crunchy and a bit sweet”. Then they let go of their nose and their face changes: apple. This taste and smell experiment kids can run with three things from the fruit bowl takes ten minutes and kills a misconception almost everyone carries into adulthood: that flavour happens on the tongue. The tongue handles five qualities. Everything else, the apple-ness and strawberry-ness and coffee-ness, arrives through the back of your nose.

Key Takeaways

• Cut 1 cm cubes of apple, pear and raw potato. Blindfold, pinch the nose, chew, and try to name them.
• It teaches multisensory flavour: gustation gives you sweet, salty, sour, bitter and umami; retronasal olfaction gives you everything else.
• Works from about age 5 to 11. Younger kids enjoy it; older ones can design the comparison properly.
• Usual failure: letting go of the nose too late, after swallowing. The release has to happen mid-chew.
• Only use foods your child already eats. This is the one cluster where tasting is the experiment, so food safety is the whole point.

What You’ll Need

Item	How much	Where to get it	If you don’t have it
Apple	1	Fruit bowl	Any firm sweet fruit
Pear	1	Fruit bowl	Jicama, or a second apple variety
Raw potato	1 small	Vegetable drawer	Raw turnip or firm melon
Onion (optional)	a sliver	Kitchen	Skip it; it is strong and makes eyes water
Jelly beans, mixed flavours	6–8	Supermarket	Contains sugar; check the pack for gelatin and colourings. Use fruit cubes only if you’d rather skip sweets
Blindfold	1	Scarf or sleep mask	A tea towel folded twice
Small knife and board	1 each	Kitchen	Adult cuts the cubes, not the child

Allergens: jelly beans can contain gelatin and artificial colours; some brands are made on lines handling wheat or nuts. Read the pack. Skip any food your child reacts to.

Time: prep 8 min, experiment 10 min, cleanup 3 min Cost: everything is probably in your kitchen Mess level: low

Do the Experiment: A Taste and Smell Experiment Kids Can Run

Step 1 — Cut matched cubes

Cut the apple, pear and potato into cubes about 1 cm on a side. Matching the size and shape matters more than you’d think: texture is a genuine clue, and a wedge versus a cube gives the game away. Keep them on separate plates and out of sight. You cut; your child waits.

Step 2 — Take the prediction

Ask: “If I block your nose completely, will you still be able to tell apple from potato?” Write down the answer. Most children say yes, confidently. That confident wrong prediction is the point of the whole exercise.

Step 3 — Blindfold and pinch

Blindfold your child, then have them pinch their own nostrils shut — their fingers, not yours, so they control it. Pinch the soft part, not hard. Hand them one cube and ask them to chew at least five times before guessing.

Step 4 — Guess with the nose shut

Go through all three cubes in random order. Record every guess, right or wrong. Apple and pear get confused constantly. Potato often reads as “a bland apple”. Sweetness still comes through, because sugar is detected on the tongue, so the fruits stay distinguishable from the potato in sweetness but not in identity.

Step 5 — Release mid-chew

Now the moment. Give them a fresh cube, nose still pinched, and have them chew three times. Then say “let go” while the food is still in their mouth. Do not let them swallow first. The flavour arrives in under a second.

Step 6 — Repeat with jelly beans and record the data

Jelly beans make a cleaner version because sugar is constant across flavours. Nose pinched, every bean tastes the same: sweet. Released, each one declares itself. Tally hits and misses for nose-shut versus nose-open across eight beans and you have a small data set worth graphing.

What you should see: with the nose blocked, roughly chance-level identification of apple versus pear, and reliable detection of sweetness. On release, immediate recognition — children often laugh, because the change is abrupt rather than gradual. A few kids can still identify apple by its crunch, which is a correct and clever answer, not a failure.

What’s Actually Going On

Flavour is not one sense. Your tongue carries taste receptor cells that respond to five qualities (sweet, salty, sour, bitter and umami) through the receptor families described in Lindemann’s review of taste transduction. That is the whole gustatory repertoire. There is no apple receptor, no vanilla receptor, no bacon receptor.

Everything else comes from your nose, by a route most people have never heard of. When you chew and swallow, volatile molecules released from the food travel up the back of the throat into the nasal cavity from behind. That is retronasal olfaction, as distinct from sniffing something through your nostrils, which is orthonasal. The brain assigns retronasal odours to the mouth rather than the nose, which is why they feel like taste. Paul Rozin named this in 1982, calling olfaction a “dual sense” and documenting systematic taste–smell confusions: the same molecule is perceived as a smell when sniffed and as a taste when it arrives from inside.

Pinching your nose does not block smell receptors. It blocks airflow, so the volatiles never reach them. That is why release works instantly: the molecules are already in your mouth, waiting for a path.

Then the brain fuses the two streams. Small and Prescott’s review of odour–taste integration traces this to chemosensory regions including the anterior insula and orbitofrontal cortex, and argues the fusion depends on prior experience with that particular combination. Charles Spence’s survey of multisensory flavour perception adds the rest of the inputs: sound (the crunch), touch (the texture), temperature, and the trigeminal nerve, which handles chilli heat, menthol cool and the prickle of carbonation. Capsaicin is not a taste. It is pain, reported by a different nerve entirely.

One correction worth making while you have the apple out. The tongue map (sweet at the tip, bitter at the back, sour and salty along the sides) is wrong. It comes from a mistranslated 1901 German study, and it has been contradicted directly: Virginia Collings tested taste thresholds at specific tongue locations and found all four qualities detectable across the tongue, with only modest differences in sensitivity. If your child has a tongue-map diagram in a schoolbook, that diagram is a century-old error. You can disprove it at the table with a cotton bud and some salt water.

How to Explain It to Your Kid

Ages 5–8: Your nose has a back door

Tell them food has tiny invisible smell pieces that float off it. When you chew, those pieces go up a secret passage at the back of your mouth into your nose. The tongue only knows five things (sweet, salty, sour, bitter and savoury), and the nose knows all the rest.

Then do the release again, slowly, and ask them to say “now” the instant the flavour appears. Hearing themselves announce the moment makes the cause obvious. This is also a good moment for the honest reframe of “I don’t like that food”: sometimes it is the smell doing the disliking, not the tongue.

Ages 9–12: Name retronasal and run a proper comparison

Introduce retronasal and orthonasal. Then make it quantitative. Eight jelly beans, two conditions, tally correct identifications. Nose blocked, expect near-chance performance with flavour but perfect performance with “is it sweet”. Nose open, expect most flavours correct.

Have them write the two numbers as fractions and then as percentages. Then ask the harder question: what would happen with a blocked nose and a sour sweet? Sourness is a tongue quality, so it should survive. Predicting which properties survive the block is the real test of whether the idea landed.

Ages 13+: Separate the senses that build flavour

With a teenager, go after the full list of contributors: gustation, retronasal olfaction, trigeminal chemesthesis, texture, sound, temperature and colour expectation. Each can be manipulated independently, which makes this a design problem rather than a demo.

The extension: serve the same apple juice at 5 °C and at room temperature and have a panel rate sweetness. Warmer solutions usually taste sweeter, partly because volatiles release faster and partly because of receptor temperature sensitivity. Or blindfold the panel and serve identically flavoured drinks dyed different colours — with the blindfold off, colour shifts the reported flavour. That is where the science of why sick people lose their appetite starts to make sense.

The question to ask: “If you had a bad cold and your nose was completely blocked, which would still taste right to you: lemonade or strawberry milk? Why?”

Why Teaching This Early Pays Off

This one has an unusually direct payoff, because it makes a confusing everyday experience legible. Children who understand that flavour is mostly smell stop being baffled when food “tastes wrong” during a cold, and they get a real explanation for why they refuse some foods: aroma, not tongue. Our piece on what research says about picky eating strategies covers how that framing can change a dinner-table argument.

In school it pre-loads the senses and nervous-system units in middle-school biology, and it sets up the idea of multisensory integration, which later carries weight in psychology and in anything involving sensor fusion. It also inoculates against the tongue map, which is still printed in textbooks and worksheets.

On the evidence: the useful research finding here is not about taste at all. Chi and Wylie’s ICAP framework argues that learning outcomes improve as learners move from passive to active to constructive to interactive engagement — and the interactive tier means explaining and arguing, not just doing. So the version of this experiment that teaches is the one where your child predicts, records, and then tells you why their prediction failed. The version where they eat jelly beans while you narrate teaches less. Nobody should claim that one afternoon of apple cubes changes academic outcomes. What it reliably does is leave behind a correct mechanism in place of a wrong one, which is worth ten minutes.

Before You Start: What Parents Should Know

Best age	5 to 11. Under five, the blindfold plus nose-pinch combination is often too much at once; drop the blindfold and just use the nose.
Supervision	Constant. An adult cuts all food and stays with the blindfolded child the whole time.
Real hazards	Choking and allergy. Cubes no larger than 1 cm, child seated, never lying down or walking. Use only foods your child already eats safely.
Don’t	Don’t put anything unfamiliar in a blindfolded child’s mouth, don’t use nuts or whole hard sweets, and don’t pinch their nose for them.

This is a food experiment and every item in it is food-grade, so tasting is allowed here. That is not true of most experiments, and it is worth saying out loud to your child: in this one we eat the materials, in the others we never do. If your family manages food allergies, our guide to managing kids’ food allergies is the better starting point than a blindfold.

When It Doesn’t Work

• They identify everything correctly with the nose blocked. Usually texture. Apple is crunchier than pear, pear is grainier, potato squeaks. Fix it by grating all three finely, or switch to jelly beans where texture is identical.
• The release moment produces nothing. They swallowed first. Volatiles need to still be in the mouth. Try again with a bigger cube and a firm instruction not to swallow until you say so.
• The nose pinch leaks. Children often pinch the bony bridge instead of the soft nostrils. Have them hum: if they can hum, air is still moving.
• Everything tastes like onion. One sliver of onion contaminates the whole tray. Keep onion on a separate plate, last, or leave it out.
• Your child refuses the blindfold. Skip it. Closed eyes and an honest promise work almost as well, and the nose is the variable that matters.

Take It Further

Build a flavour-identification score sheet. Eight items, two conditions, three trials each. Record hits for nose-blocked and nose-open, then calculate the percentage difference. Add a third condition (nose open but eyes open too, with the food visible) and see whether seeing the food improves accuracy beyond smelling it. Visual expectation is a real effect and children find it unnerving.

Test the temperature variable. Same apple juice, served at refrigerator temperature and at room temperature, rated 1 to 10 for sweetness by three family members who don’t know which is which. Record the ratings and average them. One variable changed, everything else held constant: that is the structure of a controlled experiment, learned on juice.

What to Watch For Over the Next 3 Months

• Week 4: The next time they have a cold, they say something like “I can’t taste anything because my nose is blocked” — and mean it mechanistically rather than as a figure of speech.
• Month 2: They start sniffing food deliberately before eating it, or hold their nose to get through something they dislike. That second one is applied science.
• Month 3: A question about animals: do dogs taste more than we do? The honest answer is that dogs have far fewer taste receptor types and vastly more olfactory receptors, which is a good hook into comparative biology.

Frequently Asked Questions

Is it true that taste is 80 percent smell?

That number gets repeated constantly and no good study supports a specific percentage. What is well established is qualitative: gustation provides five taste qualities, and the identity of a flavour (apple, coffee, cinnamon) comes from retronasal olfaction. “Mostly smell” is accurate. “Exactly 80 percent” is not.

Why does food taste bad when I have a cold?

Congestion blocks the airflow that carries volatile molecules from your mouth to your olfactory receptors. Your taste buds work fine, so you still get sweet and salty, but the identity of the food disappears. People describe this as losing their taste when they have actually lost retronasal smell.

Is the tongue map in my child’s textbook wrong?

Yes. The idea that sweet is detected at the tip and bitter at the back comes from a mistranslated 1901 study. Collings showed in 1974 that all taste qualities are detectable across the whole tongue, with only small sensitivity differences. The diagram persists because it is easy to draw.

Does chilli heat count as a taste?

No. Capsaicin activates receptors on trigeminal nerve endings that normally report heat and pain, which is why chilli burn feels like temperature and why it also works on your lips and eyes. Menthol cooling and the fizz of carbonated drinks are the same system. Flavour includes it, but taste does not.

Can I do this without sweets?

Easily. Apple, pear and raw potato cubes are the classic version and work better than jelly beans for the apple-versus-pear confusion. The jelly bean version’s advantage is that sugar is identical across flavours, which isolates the smell variable more cleanly. Either is a real experiment.

---

About the author

Ricky Flores is the founder of HiWave Makers and an electrical engineer with 15+ years of experience building consumer technology at Apple, Samsung, and Texas Instruments. He writes about how kids learn to build, think, and create in a tech-saturated world. Read more at hiwavemakers.com.

---

Sources

1. Lindemann, B. (2001). “Receptors and transduction in taste.” Nature, 413, 219–225. https://doi.org/10.1038/35093032
2. Rozin, P. (1982). “‘Taste–smell confusions’ and the duality of the olfactory sense.” Perception & Psychophysics, 31, 397–401. https://doi.org/10.3758/BF03202667
3. Small, D. M., & Prescott, J. (2005). “Odor/taste integration and the perception of flavor.” Experimental Brain Research, 166, 345–357. https://doi.org/10.1007/s00221-005-2376-9
4. Spence, C. (2015). “Multisensory Flavor Perception.” Cell, 161, 24–35. https://doi.org/10.1016/j.cell.2015.03.007
5. Collings, V. B. (1974). “Human taste response as a function of locus of stimulation on the tongue and soft palate.” Perception & Psychophysics, 16, 169–174. https://doi.org/10.3758/BF03203270
6. National Institute on Deafness and Other Communication Disorders. “Taste Disorders.” National Institutes of Health. https://www.nidcd.nih.gov/health/taste-disorders
7. Chi, M. T. H., & Wylie, R. (2014). “The ICAP Framework: Linking Cognitive Engagement to Active Learning Outcomes.” Educational Psychologist, 49, 219–243. https://doi.org/10.1080/00461520.2014.965823