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The term water reten­tion (also known as flu­id reten­tion) sig­ni­fies an abnor­mal accu­mu­la­tion of flu­id in the cir­cu­la­to­ry sys­tem or with­in the tis­sues or cav­i­ties of the body. Water is found both inside and out­side the body’s cells. It forms part of the blood, help­ing to car­ry the blood cells around the body and keep­ing oxy­gen and impor­tant nutri­ents in solu­tion so that they can be tak­en up by tis­sues such as glands, bone and mus­cle. Even the organs and mus­cles are most­ly water. The body uses a com­plex sys­tem of hor­mones and hor­mone-like sub­stances called prostaglandins to keep its vol­ume of flu­id at a con­stant lev­el. If one were to intake an exces­sive amount of flu­ids in one day, the amount of flu­id would not be affect­ed in the long-term. This is because the kid­neys quick­ly excrete the excess in the form of urine. Like­wise, if one did not get enough to drink, the body would hold on to its flu­ids and uri­nate less than usual.