GFR... glomerular filtration rate, they say it's the cleaning speed of your kidneys. The doctors explain that 180 litres is filtered, but most is taken back by the body—only the waste becomes urine. My own reports show a lower GFR now, a number that sits in my mind like a pending frost warning. You see, with sugar and BP, the filter itself can get slow, so the body's clever reabsorption isn't so clever anymore—sometimes you pee more, sometimes less, but the worry is always if the filter is still working.
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