A 52,000-person study published in Nature Medicine in 2022, the largest of its kind in humans, discovered one common factor in every overweight man and woman. Low brown adipose tissue levels were also found to be common in all skinny people, as were high brown adipose tissue levels. However, it has the ability to burn up to 300 times more calories than any other cell in your body.

Brown adipose tissue, also known as brown fat, is not actually fat. It is a fat shrinker rather than a fat stored, and its brown color comes from its densely packed mitochondria, which work around the clock to convert calories from your fat stores and the food you eat into pure, natural energy.

Despite accounting for only a small portion of your body weight, BAT can burn up to 300 times more calories than any other cell in your body.