When I was diagnosed in emergency in August after an ultrasound for hydronephrosis, secondary to an enlarged prostate size 99cc, my eGFR from a previous lab test was at 69. In emergency, it fell to 55, this was in August.
I was catheterized with an indwelling urethral Foley catheter so the retention and back-flow up though the ureters to the kidneys would stop. Since then, my last two ultrasounds indicated both kidneys at normal size.
After three months of using the catheter, the catheter was removed and I went home, but could not urinate after four hours. I went back to emergency. The inevitable UTI was detected with two bacteria. A new catheter was placed. Antibiotics given must have wreaked some havoc on my kidneys because my skin was itching profusely after about three days of a seven-day treatment (Cefuroxime 500m.g. 1 T p.o. Bid 12hrs). This UTI seemed to have been killed off, but another came three weeks after the first one.
On the 19th of December, this month, I had more labs made. Hemograph, they call it, renal function and urinalysis- *all of which were done fasting and with the same antibiotic for a second UTI- with three bacteria incl. staph. The results came back yesterday 24th December. eGFR went up from 55 in August to 75. Creatinine levels dropped from 1.16 to 95 (1.07 mg /dL). Urinalysis indicated protein at 1, which may be normal due to UTI and antibiotics. The ONLY thing they did not test for, was blood glucose. But, the urinalysis detected NO GLUCOSE.

As for diet, I have found a bakery that makes white bread without sugar and salt! I've been mostly on well-rinsed seasoned garbanzo beans with fresh garlic & chopped parsley & red leaf lettuce salads with olive oil only. I buy a bag of little red apples (crab apples?) and sweet purple onions and roast them with thyme and drizzle with olive oil after no salt. I'll add this to other meals as a side. I reserve some of the apples to make homemade apple sauce with cinnamon and clove & a dash of lemon. No sugar necessary if you use a little water and simmer low while covered. Best applesauce I've ever tasted, not to toot my own horn.
The DaVita site as well as this Mayo forum, it's members have been really informative.
I drink at least 3 liters of water, just under a gallon (US). Since another member here offered a genius approach to hydration, protein and simplicity, I started making a homemade vegetable broth with a ball of ground beef in it and a chicken sandwich in the afternoon with roasted chicken tenders- whoever you are: THANK YOU!
I want to "eat for the labs" so with these alterations and daily walking, I hope I can bring the eGFR higher.
I'm a Caucasian male, 59 years old.