http://en.wikipedia.org/wiki/Heavy_water http://en.wikipedia.org/wiki/Heavy_water An early experiment reported not the "slightest difference" in taste between

http://en.wikipedia.org/wiki/Heavy_water http://en.wikipedia.org/wiki/Heavy_water An early experiment reported not the "slightest difference" in taste between ordinary and heavy water; on the other hand, rats given a choice between distilled normal water and heavy water were able to avoid the heavy water based on smell, and it may be possible that it has a different taste.