Hypoosmolality

Overview
Hyposmolality or hypoosmolality is the condition especially of a bodily fluid of having abnormally low osmolality.

Physiology of Osmolality
Plasma osmolality is a function of the ratio of body solute to body water. Plasma osmolality is regulated by changes in water balance. Water intake is derived primarily from three sources: Water losses occur in the urine and stool, as well as evaporation from the skin and respiratory tract. Alterations in plasma osmolality of as little as 1% - 2% are sensed by osmoreceptors in the hypothalamus. These receptors initiate mechanisms that affect water intake (via thirst) and water excretion (via antidiuretic hormone ADH) to return plasma osmolality to normal.
 * 1) Ingested water
 * 2) Water contained in food
 * 3) Water produced from oxidation of carbohydrates, proteins, and fats.