In a study published in the New England Journal of Medicine and cited by Time Magazine, researchers found a discrepancy between white fat and brown fat.

In addition, researchers noted that adults had more brown fat than previously expected.

Brown fat, typified by its discoloration due to a large proportion of darker mitochondria, or energy-providing cells, actively breaks down sugars and burns more energy than white fat.  Brown fat is found in higher concentrations in newborns; however, researchers have found that as people age, brown fat is replaced by white fat, which plays the role of fat storage.

In this new study, researchers found that adults retained brown fat deposits in the front and back areas of the neck. Therefore, many are thinking that a fat-based solution to combating obesity may not be far behind.

Further details can be found here:

Brown Fat in Adults