Tight Control Decreases Kidney Deterioration by 50% in People with Type 1 Involved in DCCT

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Another study, that followed people with Type 1 diabetes for more than a decade found that those who had achieved "Tight control" in the DCCT (defined as A1cs near 7%) had half the risk of developing the condition leading to kidney failure than those who did not. The full text article explains that it took ten years for the impact of that early tight control to become evident.

Lower A1cs, in the 5% range--which are easier for people with Type 2 to achieve than for those with Type 1--would likely reduce this risk a lot further.

Intensive Diabetes Therapy and Glomerular Filtration Rate in Type 1 Diabetes: The DCCT/EDIC Research Group New England Journal of Medicine, November 12, 2011 (10.1056/NEJMoa1111732)