Xylitol has also been known to cause intestinal discomfort in humans. People who consume a lot of it at once often report diarrhea or cramping. Although it can be beneficial for dental health and even ear infections, the fact that it is so deadly to dogs will certainly give many people pause before consuming it.
The truth is that many artificial sweeteners are a lot worse for the body than sugar itself. Saccharin, aspartame and sucralose have been linked with metabolic issues, weight gain and even cancer.