Fat people have less than thin people. Older people have less than younger people. Men have less than younger women. It is brown fat, actually brown in color, and its great appeal is that it burns calories like a furnace... --snip-- The brown fat also kept its subjects warm. The more brown fat a man had, the colder he could get before he started to shiver. Brown fat, Dr. Carpentier and Jan Nedergaard, Dr. Cannon’s husband, wrote in an accompanying editorial, “is on fire.” On average, Dr. Carpentier said, the brown fat burned about 250 calories over three hours. But...