7. Celery Root
Celery root has both potassium and sodium, so it gives kidneys what they need to do their work. It also contains a lot of water and increases urine output, allowing your body to flush out residual toxins. Eating celery root is thought to prevent bacterial infections of both kidneys and urinary tract. Some studies indicate that celery can shrink cysts on reproductive organs, too.
Celery has a relatively low level of potassium with even a large stalk containing only 4% of basic RDI. However, speak to your doctor about adding celery to your daily diet if you have existing kidney disease.