Studies done many years ago suggested that eating a lot of protein increases calcium loss in the urine and therefore it was thought that eating protein weakens bones by taking calcium out of them. However, recent studies show that eating protein increases calcium absorption so the extra calcium in the urine comes from increased absorption, not from being take out of bones. Reports in the American Journal of Clinical Nutrition (Volume 78, Issue 3, 2003) showed that eating plenty of protein and lots of foods from plants helps to keep bones strong. Most scientists now feel that a very low-protein diet can cause osteoporosis, while a moderately high-protein diet may help to prevent it.
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