People following a kidney diet may be told to avoid foods that are high in phosphorus, such as beer, soda, cheese, milk, yogurt, oysters, beans, peas, nuts, and many whole grain products.
Aside from foods that are rich in phosphorous, potassium needs to be avoided/minimized as well. Avoiding foods with high levels of potassium, while maintaining a healthy diet can be quite difficult because many fruits and vegetables are high in potassium. Oranges, broccoli, tomatoes, potatoes, and carrots are all high in potassium. Apples, blueberries, grapes, strawberries, lettuce, and onions are all relatively low in potassium. Canned vegetables and the juices they are usually canned are particularly high in potassium. For patients with kidney problems who want to eat certain high potassium vegetables, there is one method for removing some of the potassium, called leaching. This process varies depending on the vegetable, but generally it involves repeatedly rinsing and boiling the vegetable in a large amount of water.



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