Since I'm not that used to artificial sweateners ( I dont drink coke or anything related to sugar ), the taste was noticiable inmediatly, it didn't bother me, it was just a curious feeling of being able to detect it so quickly. I ate like 3 or 4, those things were addictive.
What bothered me was what happened a couple of hours later, I had a massive stomach bloat and ache, higher than normal body temperature and generally felt like I was gonna throw it up and I couldn't hold it. After an hour of lying in the sofa I said that it was enough and indeed, threw up my dinner that night.
To my list of things I don't eat, xylitol was added inmediatly, I have never felt so sick, so fast in so little time.