A 2008 paper out of the Dana-Farber lab of Bruce Spiegelman, PhD, had proposed the existence of a third type of fat cell, and now Spiegelman and his team have become the first to isolate them and determine beige fat’s unique genetic profile. They found that beige fat shares much in common with brown fat. Both have the ability to burn large amounts of calories as they both contain energy-burning organelles called mitochondria, which contain iron and are responsible for the cells’ brown and beige hues.
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