I am a 61 year old female. I am a teacher of little children so I am active enough. I could probably lose a few pounds, but am not seriously over-weight. I donated a kidney 3 years ago and in the last year have had a lower GFR 43. Creatinine has been mildly up but in the normal range. I went to a renal specialist and after a 24 hour urine they said my GFR is more in the range of 69. They said to come back if I experienced high Creatinine and that the lower blood GFR could be due to more muscle than the typical woman of my age. My internist says not to worry, but it is hard not to. I never thought about GFR before!! I try to drink enough water but often fall very short on this. Could dehydration be the cause and am I able to raise my GFR? Feeling good in all aspects, no meds or NSAIDS-just occasional Tylenol, take vitamins, normal activity, no diabetes or high blood p. Just arthritis.Not a drinker. Advice to move on take care of self and not worry?