Genetics probably has some influence over it, too, if you believe other mice experiments. http://www.nytimes.com/2013/07/19/health/overweight-maybe-you-really-

Genetics probably has some influence over it, too, if you believe other mice experiments. http://www.nytimes.com/2013/07/19/health/overweight-maybe-you-really-can-blame-your-metabolism.html http://www.nytimes.com/2013/07/19/health/overweight-maybe-yo...