It all depends on how much is too much. A very high protein diet can cause the kidneys to work harder and cause the bones and teeth to excrete calcium since protein foods (meats) are usually higher in fats (depending on your choices). This can increase the unhealthy saturated fat and be a risk factor for heart disease, certain cancers, weight gain and high blood pressure. High protein diets are sometimes low in fiber which is associated with intestinal disorders such as constipation, diverticular disease, and cancer.