The experiment, conducted in the US for Diabetes, tested the presence of 'brown fat' in healthy men over the course of four months.
These men were asked to continue their daily lives while sleeping in temperature controlled rooms, with matching meals for all.
As the rooms temperatures were changed to levels both above and below what most would consider neutral (24 degrees) the blood-sugar, insulin levels and daily caloric expenditures were tracked.
Alongside this, after each month, the amount of brown fat was measured.
In the colder bedrooms the brown fat levels went up.
Unlike most of the fat in our bodies - the white stuff - brown fat is considered to have a metabolic purpose, and is mostly lost by adulthood.
The study's senior author Francesco S. Celi told The New York Times Magazine, "These were all healthy young men to start with," he says, "but just by sleeping in a colder room, they gained metabolic advantages".
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