"Like many other medical conditions, obesity is the result of an interplay between genetic and environmental factors. Polymorphisms in various genes controlling

"Like many other medical conditions, obesity is the result of an interplay between genetic and environmental factors. Polymorphisms in various genes controlling appetite and metabolism predispose to obesity when sufficient food energy is present." http://en.wikipedia.org/wiki/Genetics_of_obesity http://en.wikipedia.org/wiki/Genetics_of_obesity Over-eating is required.