<P> In addition, there are visceral osmoreceptors . These project to the area postrema and nucleus tractus solitarii in the brain . </P> <P> Because sodium is also lost from the plasma in hypovolemia, the body's need for salt proportionately increases in addition to thirst in such cases . This is also a result of the renin - angiotensin system activation . </P> <P> In adults over the age of 50 years, the body's thirst sensation reduces and continues diminishing with age, putting this population at increased risk of dehydration . Several studies have demonstrated that elderly persons have lower total water intakes than younger adults, and that women are particularly at risk of too low an intake . In 2009, the European Food Safety Authority (EFSA) included water as a macronutrient in its dietary reference values for the first time . Recommended intake volumes in the elderly are the same as for younger adults (2.0 L / day for females and 2.5 L / day for males) as despite lower energy consumption, the water requirement of this group is increased due to a reduction in renal concentrating capacity . </P> <P> The areas of the brain that contribute to the sense of thirst are mainly located in the midbrain and the hindbrain . Specifically, the hypothalamus appears to play a key role in the regulation of thirst . </P>

Where is the thirst center of the human body located