The studies describe a “very good” eGFR for one’s age as an indicator for a higher death rate. Seemingly, this is from a point in time it was once fairly lower, but I haven’t been able to discern that from the skimming of the two free studies, yet.
I will say some supplement changes a year ago made my eGFR go up nearly 15%. It centers around when my wife and I started taking GlyNAC, Taurine, and Urolithin A, and I took the test about seven months later.
I feel like they are trying to increase the population requiring some form of kidney treatment. I am not going to go into all the crap I went through regarding my weightlifting and supplementation and what they wanted to do to me. That they said I had moderate to severe kidney disease. They sent me to get kidney ultrasounds etc. which showed perfectly normal function. My urinalysis was also perfect. Everything was based on ratios in the bloodwork related to creatinin levels.
The bottom line is I stopped working out with weights and taking any creatine supplements for one month and my metrics were suddenly normal (which I tried to explain to them all along. That my supplementation and high muscle mass were impacting my ratios.)
Big pharma wants as many people as possible on these new CKD prescriptions, so they are getting the medical establishment to use these ratios indiscriminately.
My rule of thumb, is without any symptoms and good blood sugar and good urinalysis, anyone over 50 should ignore those stupid ratios.