"The role of heredity in the production of Diabetes"

From a practical standpoint, strongly believes that "sugar disease" are hereditary and racial and ethnic factors are involved in the production of this type of entanglement between the ski sugar disease cases are very rare, while blacks and Mexican Americans, much more than it affected.
However, despite being clearly above issues, the experts believe that distinguish genetic effects of environmental impacts, such as nutritional habits, is precisely the problem. And even in cases where the deterministic theory of disease was hereditary information, subsequent studies have shown contradictory. Studies in the United States of America, Canada and the UK show that, in people who were born twins, diabetes affects only fifty percent of both of them. In fact, if the second of twins, in 2 or 3 years to prevent diabetes, the general will not be affected.

Probably a virus can fire their preparations for the production of diabetes in a shed, but they may fail in another. So, apparently there is something in the environment that is incompatible with hereditary predisposition.