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ELI5 Yahaaa

Five basics, plus your nose

How Does Taste Work?

Your tongue detects only about five things. Everything else in flavour comes from smell.

Sweet — energySalty — mineralsSour — acid or spoilageBitter — possiblepoison
Five verdicts, each with a survival job.

  1. Step 1 of 5

    Taste buds detect dissolved chemicals.

    1 Food enters themouth2 It dissolves insaliva3 Receptorsdetect thechemicals

    Food must dissolve in saliva to be tasted at all. Receptor cells in each bud respond to particular dissolved substances.

  2. Step 2 of 5

    There are about five basic tastes.

    Five basic tastes

    Sweet, salty, sour, bitter and savoury. Everything else you think you taste is your nose contributing.

  3. Step 3 of 5

    Each one is a survival judgement.

    Sweet and savoury Eat this — usefulBitter and very sour Careful — possiblyharmful

    Sweet means energy. Salty means needed minerals. Sour and bitter warn of spoilage and poison — which is why they are unpleasant by default.

  4. Step 4 of 5

    The tongue map is a myth.

    The old diagram?Sweet at the tip,bitter at the backReality All tastes, everywhere

    There is no zone for each taste. All five receptor types are spread across the whole tongue — the textbook diagram was simply wrong.

  5. Step 5 of 5

    Flavour is mostly smell.

    Chewing releasesodour It reaches thenose from inside

    Chewing pushes odour up into your nose from behind. That is where the difference between strawberry and raspberry actually comes from.

    Children have more taste buds than adults, which is part of why strong flavours can be overwhelming for them.

The short version

The tongue detects about five basic tastes, each with a survival purpose, and smell supplies the rest of flavour.

Try it yourself

Taste a strawberry and a raspberry with your nose held. Almost indistinguishable — both are just sweet and slightly sour.

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