A study from the University of Sherbrooke at Quebec found that brown fat, named for its brown color, burns an immense number of calories under at least two conditions: when you're cold and shivering, and when you're exercising. It was previously thought that brown fat was only found in babies until they developed the shivering response, but the recent study has shown differently.
In a study of men, when the men were cold (but not yet shivering), their metabolic rate increased by 80 percent. The brown fat also kept the subjects warmer for longer. The study found that over three hours, the brown fat burned an average of 250 calories. Three different groups of researchers, including the Joslin Diabetes Center in Boston, have found results similar to this, concluding that brown fat does burn fat in adults.
This article primarily uses ethos to make its argument. They cite several researchers and doctors, including Dr. Andre Carpentier at the University of Sherbrooke at Quebec. They also say that the study results at the University of Sherbrooke are not along; they cite three other research groups that have found similar results. The researchers are also optimistic that these findings may one day lead to innovative weight loss programs, which would appeal to people's emotions and desire to lose weight, making it a pathos argument.
http://www.nytimes.com/2012/01/25/health/brown-fat-burns-ordinary-fat-study-finds.html?_r=1&hp
http://www.nytimes.com/2009/04/09/health/research/09fat.html?scp=1&sq=kolata%20brown%20fat&st=cse
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