How to eliminate fat is what gives some people sleepless nights.

But now, fat people can sleep easy because the culprit to having a fat body has been discovered by American scientists.

The scientists have discovered that a group of cells in the small intestine slows down metabolism and increases fat accumulation.

The study published on Wednesday in the journal, Nature, may lend a clue to prevent and treat obesity, diabetes and hypertension.

Researchers from Massachusetts General Hospital in the US found that mice lacking those cells called intraepithelial T lymphocytes or natural IELs could burn fat and sugar without gaining weight.

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When those cells are present, they suppress a hormone that speeds up metabolism and conserves more energy it gets from food.

Such a mechanism used to be an evolutionary advantage when food was scarce in ancient time, but “with the food so abundant, this energy-saving mechanism can backfire and lead to unhealthy outcomes,” said the paper’s lead researcher Filip Swirski from Massachusetts General Hospital.

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