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I am Mysticdoc, experienced Internal Medicine Specialist.
I am here to help you with your concerns.
That is unusual advice with decreasing kidney function.
Normally we suggest the opposite --that is water restriction since kidneys have to work hard with more water intake.
However, there is an exception.
if you are dehydrated, then that can also cause decrease in kidney function.
In that case, a repeat blood test will show improvement with water intake.
However, given the history of diabetes, your kidney problem is likely due to the diabetes.
Too much water is not recommended in that case.
You should consult with a kidney specialist ( nephrologist) for further evaluation.
besides repeat blood test, you will also need kidney ultrasound, urine tests to properly assess your kidney problem.
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