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NBC - Cranking the thermostat down a few degrees might cost you more in the summer, but it's a big boost to your health.

Researchers studied people while they slept for a month. They found when people slept in a 66 degree room for 30 days, they had double the amount of brown fat, a good fat that produces body heat.

An increased level of brown fat means better insulin sensitivity and a reduced risk of diabetes, researchers said.

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