Enchanting chocolate
Researchers have new evidence in rats to explain how it is that chocolate candies can be so completely irresistible. The urge to overeat such deliciously sweet and fatty treats traces to an unexpected part of the brain and its production of a natural, opium-like chemical, according to a report published online on September 20th in Current Biology, a Cell Press publication.
“This means that the brain has more extensive systems to make individuals want to overconsume rewards than previously thought,” said Alexandra DiFeliceantonio of the University of Michigan, Ann Arbor. “It may be one reason why overconsumption is a problem today.”
DiFeliceantonio’s team made the discovery by giving rats an artificial boost with a drug delivered straight to a brain region called the neostriatum. Those animals gorged themselves on more than twice the number of M&M chocolates than they would otherwise have eaten. The researchers also found that enkephalin, the natural drug-like chemical produced in that same brain region, surged when rats began to eat the candy-coated morsels, too.
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