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Plant proteins are not only free of animal fat and cholesterol; they are also free of two problems caused by animal proteins. First, animal protein is linked to osteoporosis, apparently because it causes the kidneys to lose calcium in the urine. If you were to check urine samples from people following meaty diets—especially high-protein Atkins-style diets—you would find that they lose calcium rapidly.3 Sodium does the same thing, as we’ll see below. Second, animal protein is also linked to gradual loss of kidney function. Harvard researchers studied a group of women who had already lost some kidney function, as many people do, due to high blood pressure, diabetes, urinary infections, or other factors. As the years went by, the researchers found that those women who tended to get their protein from animal products were much more likely to experience continued loss of kidney function.4 Protein from plants did not have this effect. So if you get your protein from beans, grains, vegetables, and other foods from plant sources, your kidneys will breathe a sigh of relief.