Some recomendations from diverse medical systems:
Culpepper's Complete Herbal (the most famous medieval herbal book): recomends most fruits as being healing to the kidneys, as well as kidney beans, chickpeas and green peas. You should notice that eating kidney beans stimulates your kidney and bladder and produces smooth skin, so there is some medicinal compound that acts on your kidneys.
Chinese Medicine: kidney organ meat is the most recommended food, but also seawood, salt and black beans.
Alkaline Diet: Common medical advice is that excessive protein intake is harmful for those with kidney disease. Roiders often get kidney disease. If you consume too much acid minerals and protein, then it is stressful to the kidneys, since they need to have a somewhat balanced intake of alkaline minerals in order to excrete the acid minerals and urea, because your bladder does not like storing super acidic piss.
Fruit, potatos and leafy greens are the most alkaline foods. Once again a recommendation to eat fruit.
Walter Kempner Rice Diet: The Rice Diet Program was founded in 1939 by Dr. Walter Kempner (1903-1997) who was at that time associated with Duke University.[1] [2] Kempner had many patients with malignant hypertension with kidney failure, and there were no good treatments for those patients. He believed that the kidney had two functions, one excretory and the other metabolic, and "he theorized that if the protein and electrolyte load on the kidney was reduced to a minimum, the kidney might better perform its more essential metabolic role. The details of his reasoning are obscure, but he began to treat patients with malignant hypertension with a diet composed of nothing but rice and fruit, and amazingly, they rapidly improved.
Coffee can be bad for kidneys due to overstimulating them to be constantly pissing.
