I wonder if they've ever considered injecting such areas with insulin bound sugars. Normally insulin is taken and then binds with sugars in the body which then allows the sugar to enter cells which require insulin to be the key which opens the cells for the exchange. For problem areas why not bind the insulin and sugar first outside the body and then inject directly in those problem areas.
As for sugar, syrup or honey in a wound, I think it works several ways. It's a preservative like when done for sugar cured hams. It also encourages beneficial yeast in an area which may give protection against invasive destructive bacteria like gangrene. The body's cells will take some of the energy in directly and be energized to more efficiently accomplish the necessary task.
The best way to get rid of continual staph germ infections is sulfur powder daily, about third teaspoon, for a few weeks, sometimes a couple months is necessary. There's this newer sulfur compound called MSM that may do as well and be more absorbable, but don't know if it will do the same.

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