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Mild dehydration can also be caused by immersion diuresis, which may increase risk of decompression sickness in divers.
Most people can tolerate a three to four percent decrease in total body water without difficulty or adverse health effects.
In the elderly, blunted response to thirst and/or inadequate ability to access free water in the face of excess free water losses (especially hyperglycemia related) seem to be the main causes of dehydration.
Dehydration contributes to morbidity in the elderly especially during conditions that promote insensible free water losses such as hot weather.with an accompanying disruption of metabolic processes.It occurs when free water loss exceeds free water intake, usually due to exercise, disease, or high environmental temperature.Dehydration can cause hypernatremia (high levels of sodium ions in the blood) and is distinct from hypovolemia (loss of blood volume, particularly plasma).Dehydration occurs when water intake is not enough to replace free water lost due to normal physiologic processes, including breathing, urination, and perspiration, or other causes, including diarrhea and vomiting.