I am not an endocinologist (I dont think I even spelled the specialty properly!) and make no claims of expertise…..with that said it should be pointed out that there are 2 types of diabetes, the 1st is Type 1 diabetes often called Juvenile Diabetes and the 2nd Type 2, often called Adult Onset (but more and more kids are getting Type 2).
Type 1 is permanent, and is “treatable” only through the use of Insulin which takes over for the inability of the persons pancreas to process glucose at all. Most of the topics listed above do not apply here. Lifestyle choices, excercise choices or diet will not help in any way as far as Diabetes is concerned (of course, it makes a big difference as far as other health related matters are concerned). Advances in technology make living with Type 1 Diabetes much easier.
Type 2 Diabetes is very much affected by the choices one makes.
One excellent support group for Frum people is the organization Friends With Diabetes, http://www.friendswithdiabetes.org, I am sure there are others.