Nearly 80% of our body is made up of water at birth. When something in our biological make up takes up so much volume the chances are it plays a critical role in our neurobiology which also means it affects every aspect of our fitness. By the time we reach maturity water levels have stabilized to 65% for adult males and 55% for adult females which suggests that water continues to be critical throughout our lives, so the question is how much should we drink in order to be fit and healthy? Depending on where you look and who you ask the answers are going to be either up to eight glasses a day or less than eight glasses a day. Those who say we don’t drink enough also cite evidence that water helps our metabolism stay active, boosts our brain power and helps athletic performance while the critics claim that too much water makes us stupid, it can seriously depletes sodium levels in our bloodstream impairing athletic performance and can, in extreme cases, also kill us. Both camps ...