People who r saying ice cubes are not harmfull then plz do some research on it on Google bcz its excess  quantity also is harmful to you ....you must be thinking how its harmful  its made of water yes true but its also called pica like clay or slate eating is bcz of pica disorder ice cubes eating also bcz of pica I guess you all people know what pica disorder ....it is disorder in which people crave for things who is not digestable and not for made to eat ...if you don't know plz search on Internet I just wrote short of it

Nw come on topic how ice cubes harmfull if you have craving its indicate you have anemia or may have colon problem ...actually it indicates that you may have colon cancer not always but yes it can be the reason....now over time eating ice cubes its frezzes your colon or intenstine wall and sucks iron .and make you deficient of it...it will better if you read about this on google this will give clear theory how its harms you