Section I of III
Flavor
The biology behind what a mouthful tastes like.
2 pieces, 2026
Flavor is built by the brain from several senses at once, but this section begins with taste itself. Taste buds hold receptor cells tuned to a short list of qualities: sweet, sour, salty, bitter and umami, the savory note of glutamate. The pieces here explain what those receptors respond to and why a food that seems simple can register on several of them.
Miracle fruit has a piece of its own. The small red berry comes from a West African shrub, and it contains a protein called miraculin that attaches to the sweet receptor. Once the mouth turns acidic, the protein switches that receptor on, so lemon juice or vinegar tastes sweet until the effect wears off. The same piece looks at how regulators in the United States have treated miraculin as a food ingredient.
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How miracle fruit turns sour into sweet
A small red berry from West Africa makes a lemon taste like candy for an hour or so. The trick lives in one protein and one receptor, and regulators on both sides of the Atlantic have kept it on a short leash.
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What the tongue actually detects
The tongue reports only a handful of things, and it reports all of them from everywhere it has taste buds. Most of what people call taste arrives by another route.