The short answer is yes. Excess protein is stored as fat, which can lead to weight gain, especially if you consume too many calories in the process. Other signs that suggest excess protein include bad breath, constipation, joint pain, dehydration, etc. Not only does this mean that you are consuming too much protein, but also the fact that it might be at the cost of some other essential nutrients like carbohydrates and fiber. Kidneys especially could bear the brunt of too much protein. They have to work extra hard to get rid of waste products associated with proteins.