Too Much Protein May Lower Bone Density
You need protein to build strong bones, but when you eat too much protein, your body produces chemicals called sulfates that can cause calcium to leach out of the bones. This effect on bones is more likely to occur with animal protein than vegetable protein.
In the recent Nurses Health Study II, conducted by Harvard Medical School, 116,686 women were followed for 10 years. The researchers found that women who ate red meat at least five times a week were more likely to have a bone fracture than women who ate red meat only once a week.