If one has a predisposition to develop Type 2 diabetes, I can't imagine that being a JW doesn't contribute to it, indeed, bring on the onset. Between the lack of encourage of exercise (i.e., the constant sitting at meetings, assemblies, conventions; the "slow drag" in field service, the whole "bodily training beneficial for a little" thing) coupled with the humongous amount of stress (as a publisher, pioneer, elder, servant, wife, husband, mother, father, son, daughter, etc.) creats a breeding ground for the ailment, IMHO.
Take [good] care of yourselves... and your children... and peace to you!
A slave of Christ,
SA