Many people are under the impression that high protein diets are evil and cause all types of diseases, however a recent study says that notion is nonsense.
A study published in the Journal of Nutrition and Metabolism found that in resistance-trained men that consumed a high protein diet (~2.51–3.32 g/kg/d) for one year, there were no harmful effects on measures of blood lipids as well as liver and kidney function. In addition, despite the total increase in energy intake during the high protein phase, subjects did not experience an increase in fat mass.
A High Protein Diet Has No Harmful Effects: A One-Year Crossover Study in Resistance-Trained Males