Similar to how dairy and the aforementioned fruits can be harmful to someone's kidneys, sweet potatoes are another food high in potassium. Although diets high in protein, phosphorus, and potassium are tolerated by healthy kidneys, renal health can be improved if these nutrients are consumed in moderation. Eating less can help people prevent kidney illness completely because renal disease patients are put on specific diets that restrict their intake of these substances. Many of the items already mentioned on this list, including foods like sweet potatoes, are very healthy; nonetheless, considering the long-term effects, it may be prudent to partially avoid hazards that could eventually result in renal failure.