my mother has been experiencing frequent diarrhea for over 3 months. she went to her doctor and the doctor did a series of tests including a stool sample which came back negative. However her bad cholesterol was up and her good down and said that her kidney function has lowered. She should eat more fruits and vegetables. However If she does she spends even more time running to the bathroom then she is already. Can the diarrhea and kidney function decline be linked?