We need to realize that what is healthy for us is not always healthy for our animals. Case in point, a 'healthy' sweetener - xylitol - is so toxic for your dog that you might not even get him to the vet before it's too late if he ingests it.
Click here for a full article on the subject.
http://www.usatoday.com/news/health/
2007-03-18-xylitol-sweetener_N.htm
Let's take care of our animals the way we would our children - recognizing that their bodies don't necessarily process foods like we do and we need to be gentle with them.