Do PPI's stop all acid production or do you still have enough to digest food? Is digestion slowed down because of the reduction?

Not enough, yes. The intent of PPI therapy is to totally shut down acid production & they reduce acid up to 99%. This does interfere with digestion, preventing breaking down protein & decreasing absorption of minerals like calcium & magnesium as well as B12. Our bodies go to a lot of trouble to make HCl and reducing it has serious consequences. I advise not using PPI's for more than 3 mos. See