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Most processed food is chock-full of sodium, which isn’t just bad for your heart—it can also lead to kidney problems. When you’re showing signs you eat too much salt, your body needs to flush the sodium out when you pee, and it takes calcium with it. In turn, having too much calcium in your urine increases your risk for kidney stones, says James Simon, MD, nephrologist with Cleveland Clinic. The Dietary Guidelines for Americans recommends capping sodium at 2,300 milligrams a day, but the average American has more than 3,400 milligrams every day—and some people eat twice that. Take a look at your nutrition label and you might be surprised how quickly sodium can add up. People look at carbs and fat and calories, but they don’t pay attention to sodium