Is no food, only water being anorexic?

Ok just to let u no i dont want to do this but my wierdo friend somehow got us on a convo bout how children in haiti dont get to have food like we do. So she want to see what it would be like to not eat for like 3 days and just drink water or something like that. I was just thinking, wouldnt that be considered anorexic? Also how long can a person last without food? Also i know my friend is pretty crazy but we got her out of it say she would probably die and stuff.