the.com/bitterness

the taste your tongue invented to stop you from eating poison.

means A sharp, lingering harshness — either the literal acrid taste on the tongue or the emotional resentment that sours a person after hurt or disappointment.

from From Old English 'biter,' meaning sharp or cutting, with the abstract '-ness' suffix tacked on to name the quality itself. 'Biter' traces back to the Proto-Germanic root that also gave us 'bite' — the idea being that a bitter thing 'bites' the tongue, a sensation so vivid the same word came to bite the heart. Cousins survive across the Germanic family, like German 'bitter' and Dutch 'bitter.'

survival sense
Humans detect bitterness at far lower doses than sweetness.
taste receptors
About 25 genes decode bitter; sweet uses just one.
acquired taste
Coffee and beer hijack a built-in warning signal.
hidden everywhere
Bitter receptors exist in lungs, gut, and sperm.
emotional borrow
English uses one word for flavor and grudges alike.
for instance

amaro montenegro — italian digestif with 40 herbs created in bologna in 1885, known for its bitter herbal profile

radicchio di treviso — italian red chicory from veneto region with naturally bitter taste, protected pdo status since 2010

caffeine in coffee — primary bitter compound in arabica beans, varies from 1.2-1.5% by weight depending on roast

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