The natural way to control diabetes is to catch it when you are still in the PRE-diabetes phase.
And avoid diabetes by exercising regularly, eating properly and if overweight, by losing extra weight.
Once we have diabetes, we have it.
Even then, eating properly, exercising, and losing extra weight can control blood sugar for a while.
But since diabetes is a progressive disease, sooner or later you will be going on medication (usually Metformin). And eventually on insulin injections.