Read some interesting stuff recently.. lots to do with salt and controling sugar levels.

I would suggest diabetics looking at

"You're Not Sick, You're Thirsty" (newer haven't read as much or)
"Your Body's Many Cries For Water"
-F. Batmanghelidj

he explains a few ways that water effects it all but here is a bit of one

"If water is in short supply, the watery bicarbonate solution that is secreted into the intestine cells may not be enough to neutralize all the acid that enters the intestinese to begin the cycle of food digestion. Consequently, one or the other has to stop coming into the intestine, or water has to be delivered to the pancreas in a sufficient amount for the pancrease to perform at least one of its functions. A commensurate reduction of insulin secretion stops the entry of water and nutrients into the peripheral cells in the rest of the body that depend on the presence of insulin for feeding the progress. By this process more water is available in the circulating blood to be delivered to the pancrease to make its watery based bicarbonate solution. When the insulin-stimulated gates are not efficient in delivering water and raw materials into the cells, they begin to wither and die. This is the mechanism behind the degenerative process associated with diabetes."
-You're Not Sick, You're Thirsty

He talks about type I and II etc

This approach costs nothing with no risk to try. Something I would look at myself.

Safer than the drugs they give us and costs nothing..

I think diet plays a key role too..

Only problem drink water makes no one money