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You have a mild decrease in your sodium level. Further testing of the urine and serum is needed to know the exact cause. The kidney is normally able to handle the 3 liters of water a day that you drink and this should not lead to hyponatremia. However individuals who drink too much water while taking part in marathons, ultramarathons, triathlons and other long-distance, high-intensity activities may lose sodium through sweat and also the increased water intake can dilute the sodium content of the blood leading to low sodium level. But drinking 3 liters should not cause this. Therefore further testing is required to find out the cause for the low sodium level. In addition to the serum and urine osmolality tests you also need to have a fasting blood glucose done.
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