The goal of a detailed renal diet plan is to limit the amounts of liquids and certain minerals the dieting individual consumes, according to the American Kidney Fund. When kidneys are not working properly, fluid and waste accumulate in the body, leading to various health problems.
The strictness of the diet depends on the stage of kidney disease present, according to the American Kidney Fund. Individuals in the early stages of kidney disease have little to no limits on what they can eat or drink. Individuals in a more advanced stage of the disease may need to limit potassium, phosphorous and fluids.