DEAR DR. ROACH: I’m a 71-year-old female. I weigh about 96 pounds, and I’m 4 feet, 9 inches tall. My blood pressure has always been good. When I was 25 years old, I donated a kidney. I was told by doctors and nurses to drink lots of fluid to take care of my one remaining kidney. After watching w hat happened to my brother and the many patients in dialysis, I made sure to drink at least 16 cups of fluid a day, including coffee, tea and water. ...read more read less