You should ask this in the USPLabs section
I wouldn't think it would have any negative effects or rebound at all, in fact, much like a keto diet it should help to actually refresh your pancreas since its not having to work do hard every day.
Diabetes comes on when the pancreas is over worked constantly and basically burns out, constantly have to excrete high amounts of insulin.
This mimics insulin, this allowing the pancreas to take a break and actually allowing it to work better, being reconditioned, when the assistance stops.
All that being said I would take a couple weeks break like every 8 weeks our so just because I believe in cycling everything.