After a quick discussion with a student today I thought I would tag in this as an example of public misconceptions and pseudo science.
A commonly held belief is that drinking more water than you necessarily are thirsty for (e.g. 8 glasses a day) is good and increases attention. However, this belief has evolved in the public conciousness without any foundation from science. It is related to the pseudoscientific concepts of toxins and 'cleansing' the body which don't hold any medical weight. Here is the study which did a meta analysis of online and journal articles as well as interviewing top nutritionalists. It was published in the American Journal of Physiology and says there is no basis for this belief at all!
http://www.ncbi.nlm.nih.gov/pubmed/12376390
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