solution for danfruff and hair fall

well the person facing this problem should know what has cause this, anti-dandrauff shampoo is not enough if one don't really know the main cause. i had a friend before that had this problem and he has tried almost all kinds of anti-dandruff shampoo and lotions but it never goes away until he went to get a doctors advice, he was told that his body lacks water , he was a softdrink addict never drink water and he was now advice to drink water to at least 8 glasses a day and constant intake of vitamin e, and he has to wash his head with cold water instead of hot. different cause different treatment.