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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Too little salt makes for a bland meal.
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3 .But too much is offensively briny.
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4 .Now, scientists have discovered why too much tastes bad.
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5 .The work is in journal Nature.
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6 .As the previous podcast noted, the cells that process taste send a unique signal to the brain for each kind of flavor.
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7 .The signals for sweet and umami make animals crave more, while sour and bitter are often rejected.
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8 .But saltiness is appealing in low doses and aversive at high levels.
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9 .The researchers found out why:
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10 .too much salt activates the cells that sense sourness and bitterness, sending unpleasant signals to the brain and transforming a tasty bite into a turn-off.
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11 .The study used mice unable to taste sourness, bitterness, or both.
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12 .Animals that could still sense one of the flavors rejected overly salty water.
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13 .But mice unable to taste sour and bitter were happy to lick up liquid that was far too briny for normal animals.
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14 .With salt being a variable flavor, our bodies can better keep its levels within a healthful range.
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15 .And leave a good taste in the mouth.
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16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwic.
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