Too Much Protein can Kill You.
Anything can and will destroy you if you over use it. Even water if you drink too much or only it, your body with break down and stop working. The body needs a variety of nutrients. Solid food has the best nutrients in them and should be the most of your consumption. Supplements, protein shakes and bars shouldn't fulfill your entire diet. My prayers and condolences for the family of Meegan Hefford (an Australian bodybuilder that died of too much protein and supplements this week.)
If you are dieting, please consider a diet that has moderation of a variety of foods. Your body needs works so much better absorbing nutrients through the natural process of breaking down solid meals. It can tell the difference between powders and process supplements.