[header] How to improve kidney function [title] Eat a balanced diet. [step] A healthy balanced diet is a major factor to good overall health, and kidney health is no exception. Avoid fatty and salty food, and eat lots of fresh fruit and vegetables. 
If you are unsure about what a balanced diet might look like, look at the food groups identified in the food pyramid and go from there. [substeps] The original food pyramid has been criticised by public health experts, so you may want to look at the more recent healthy eating pyramid which combines healthy eating with weight control.