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The kidneys filter waste products from the blood and send them out of the body in the urine. They are also responsible for balancing fluid and electrolyte levels. Water is one of the most importantTrusted Source drinks for the body. The cells use water to transport toxins into the bloodstream. The kidneys then use water to filter these toxins and create the urine that transports them out of the body. Inadequate water intake can also increase the risk of developing kidney stones. 2. Fatty fish Salmon, tuna, and other cold-water, fatty fish that are high in omega-3 fatty acids can make a beneficial addition to any diet. The body cannot make omega-3 fatty acids, meaning they have to come from a person’s diet. Fatty fish are a natural source of these healthful fats. 3. Sweet potatoes Sweet potatoes are similar to white potatoes, but their excess fiber may cause them to break down more slowly, resulting in less of a spike in blood sugar levels. Sweet potatoes also contain vitamins and miner