Researchers describe how energy expenditure and heat production are regulated in obesity through a previously unknown cellular pathway. Humans carry around with them, often abundantly so, at least two kinds of fat tissue: white and brown. White fat cells are essentially inert containers for energy stored in the form of a single large, oily droplet. Brown fat cells are more complex, containing multiple, smaller droplets intermixed with dark-colored mitochondria — cellular organelles that give them their color and are the “engines” that convert the lipid droplets into heat and energy.
Some people also have “beige”...
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