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Adipsia, also known as hypodipsia, is a symptom of inappropriately decreased or absent feelings of thirst. [ 1 ] [ 2 ] It involves an increased osmolality or concentration of solute in the urine, which stimulates secretion of antidiuretic hormone (ADH) from the hypothalamus to the kidneys.
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. [6] 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.
Loss of over 10% of total body water can cause physical and mental deterioration, accompanied by severe thirst. Death occurs with a 15 and 25% loss of body water. [4] Mild dehydration usually resolves with oral rehydration, but severe cases may need intravenous fluids. Dehydration can cause hypernatremia (high levels of sodium ions in the blood).
Older adults are prone to dehydration for many reasons. Learn how to identify the symptoms of dehydration in older adults based on how they look and feel.
Older adults need more protein to prevent sarcopenia. Research suggests that adults over 50 may need as much as 1.0 to 1.2 grams of protein per kilogram (about 2.2 pounds) of body weight per day ...
This occurs when these over-concentrated solutions sit in the gut and draw water from the rest of the body, and the reduced fluids in the body's tissues then have a higher proportion of salt to fluid. Children with serum sodium greater 150 mmol/liter have thirst out of proportion to other signs of dehydration.
Yep, this even applies to people who are already on medication.
Discontinuation of hydration does not produce true thirst, although a sensation of dryness of the mouth often is reported as "thirst". The evidence that true thirst does not occur is extensive, [ citation needed ] along with evidence showing that the ill feeling is not relieved by giving fluids intravenously, but rather by wetting the tongue ...