Adults have brown fat, and lean people have more of it than overweight people.
According to Mother Nature Network, scientists say brown fat is metabolically much more active than white fat.
Brown fat burns calories to create heat, and may also protect against obesity and Type 2 diabetes.
Research now shows that brown fat may be manipulated by ambient temperature.
In one study, mild cold exposure stimulated brown fat activity while mild warm exposure suppressed it.
Still, scientists say sitting in cold baths or sleeping in cold rooms won't do a lot. It's far better to diet and exercise!