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Whether aged persons should restrict the water intake to the minimum required level to reduce the load to the kidney?
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Water intake should be decided by your thirst level. Brain knows how much water it needs. There are mechanisms to detect how much is the water level (osmolality) in the blood and indicate you by means of thirst. Unless you are taking some drugs that can impair this ability, any kidney disease, heart problems, or brain disorders, you can take a normal 2 to 3 liters of fluid per day. You can reduce fluid intake in evening and night to prevent unnecessary sleep disturbance.
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