Does he, by any chance, also have vitiligo? If so, it’s probably the same set of autoimmune entertainment my partner has. Enjoy the likely hypothyroidism in the future, I guess. 
The blood sugar thing, though … uhmyeah. I thought walking around at 20+ (360+) for more than a few hours led to some modestly unpleasant ketone effects? Still, the “teen boy tries rebelling against his blood sugar” thing is apparently super-common; not that that helps.
