however , proper amount of daily water intake in a healthy individual is controversial . there is a prevalent thought that we all have to drink eight glasses of water daily , we try to clarify this topic from the perspective of avicenna and traditional persian medicine ( tpm ) . the most important traditional persian medical encyclopedia , al - qanun fil - tibb ( canon of medicine ) , was reviewed . furthermore , medline , embase , scopus , iranmedex , and science iranian database ( sid ) focusing on the keywords  traditional medicine  ,  water intake  , fluid , and  complementary and alternative medicine  were reviewed to find relevant information . avicenna believed that the demand for daily water is not the same in different individuals . the determinant variables mentioned in his book , the canon of medicine , comprises mizaj ( temperament ) , health status , age , sex , season , place , habits , occupation , etc . he believed that water in extra amount quenches the hararat - e - ghariezi , which is the basal internal heat to convey normal homeostasis and metabolism in the body . several factors determine the actual need of any person to drink water . consequently , recommending a specific amount of daily water intake for all is illogical . moreover , important recommendations of tpm sages on an appropriate amount of water intake should be considered to prevent associated disorders .
background : fluid intake is an essential factor in having a normal homeostasis . 
 however , proper amount of daily water intake in a healthy individual is controversial . 
 there is a prevalent thought that we all have to drink eight glasses of water daily , however , it lacks enough supportive evidence at least for healthy individuals . here , we try to clarify this topic from the perspective of avicenna and traditional persian medicine ( tpm).methods : the most important traditional persian medical encyclopedia , al - qanun fil - tibb ( canon of medicine ) , was reviewed . furthermore , medline , embase , scopus , iranmedex , and science iranian database ( sid ) focusing on the keywords  traditional medicine  ,  water intake  , 
 fluid , and  complementary and alternative medicine  were reviewed to find relevant information.results:avicenna believed that the demand for daily water is not the same in different individuals . 
 the determinant variables mentioned in his book , the canon of medicine , comprises mizaj ( temperament ) , health status , age , sex , season , place , habits , occupation , etc . 
 he believed that water in extra amount quenches the hararat - e - ghariezi , which is the basal internal heat to convey normal homeostasis and metabolism in the body.conclusion:several factors determine the actual need of any person to drink water . 
 consequently , recommending a specific amount of daily water intake for all is illogical . moreover , important recommendations of tpm sages on an appropriate amount of water intake should be considered to prevent associated disorders .