“Although protein deficiency is widespread in poverty-stricken communities and in some nonindustrialized countries, most people in industrialized countries face the opposite problem—protein excess. The RDA for a 70-kilogram (154-pound) person is 56 grams; however, the average American man consumes approximately 100 grams of protein daily, and the average woman about 70 grams. Many meat-loving Americans eat far more protein. Some research suggests that high protein intake contributes to risk for heart disease, cancer, and osteoporosis. However, because high protein intake often goes hand-in-hand with high intakes of saturated fat and cholesterol, the independent effects of high protein intake are difficult to determine.”
Book:Nutrition