“My sister said that her doctor told her not to take enzymes because your body will quit regulating your natural enzyme production”
Interesting concept and makes biological sense. Even bacteria have feedback loops to stop them from producing excess enzymes. You body will do the same thing. I would think that if you stopped the enzymes, your body would be triggered to produce them again, but there could be a short delay as your body re-adjusts.
I notice Chris Kresser has an good article on Kefir. http://chriskresser.com/kefir-the-not-quite-paleo-superfood