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Kidneys & Blood Sugar: What Happens Past 180?
28 Jul
Summary
- Kidneys filter glucose, reclaiming it via special transporters.
- Exceeding 180 mg/dL means glucose spills into urine, not kidney damage.
- Sustained high sugar can damage kidney filtering units over time.
Your kidneys meticulously filter glucose from your blood, reclaiming most of it through specialized transporters in the kidney tubules. However, these transporters have a maximum capacity.
When blood glucose levels approach 180 mg/dL, these transporters begin to reach their saturation point. Beyond this threshold, the kidneys can no longer reabsorb all the filtered glucose, causing the excess to be excreted in the urine. This level is referred to as the renal threshold for glucose.
It's important to note that this threshold isn't static and can vary based on factors like age, kidney function, pregnancy, and the duration of diabetes. The presence of glucose in urine pulls water with it, leading to increased urination and potential dehydration.
While crossing the 180 mg/dL mark doesn't signify instant kidney damage, consistently elevated blood sugar levels over months or years can exert a continuous strain. This prolonged burden may gradually damage the glomeruli, the kidney's tiny filtering units, escalating the risk of diabetic kidney disease.
Maintaining stable blood sugar through treatment, diet, exercise, and regular kidney monitoring is vital to mitigate long-term kidney injury and preserve kidney health.
