Chilled delicacy seemed bitter fruit flies

Biologists have shown that sweets seem chilled fruit
flies less appetizing than sweets at room temperature. It turned out that
cooling in itself does not affect the “sweet” neurons, but activates the “bitter”,
which indirectly inhibit the attraction of sweet water for flies, the authors write
articles in Current Biology.

It is known that temperature affects the perception of sweet taste
in rodents and in humans — for example, cold ice-cream it seems less sweet
than melted. The mechanism of this phenomenon is not entirely clear — scientists are still not
came to a common opinion, does lowering the temperature, taste adaptation,
or in the direct path of signal from receptors of sweet.

Researchers from the University of California at Santa Barbara and the National Institute of physiology, Okazaki found that such
thermal sensitivity is observed in fruit flies Drosophila, and appears
even when cooled sweet water by two degrees. Flies were offered a drop of water
with sugar, turning to their chief organ of taste — labellum (“lips”). In response to
it flies either was a good bet to eat, pulling the proboscis or not.
It turned out that the sweet water at room temperature (23 degrees Celsius) attracts flies in a hundred
percent of cases, however, even lowering its temperature to 21 degrees reduces
the percentage of cases of extrusion of the proboscis, and cooling to 17 degrees two or three times
reduces the attractiveness treats. The effect remained even after the flies
forced to starve for 20 hours.

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