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Chilli heat isn't a taste – it's a false alarm.

The TRPV1 receptor on pain nerves opens above about 43 degrees Celsius – and equally to capsaicin from chilli or to acid. So your brain gets a "hot" signal although nothing in the tissue heats up. With prolonged contact the receptor desensitises, which is why capsaicin can also numb.

Useful: Pungency belongs to the pain system, not to the five taste qualities.

Source: en.wikipedia.org

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