Official guidelines recommend getting 10% of calories from protein. Too much protein actually causes digestive disorders, reduced liver and brain function, and high cholesterol! All plant foods contain protein- even fruit! If you eat too much protein your body actually turns the protein into carbohydrates through a very taxing process.
What the function of protein is in the body- they will probably say is to replenish dead cells and to grow- babies need the most protein because they are the ones who are growing! Mother’s milk is only made up of 5-6% of calories from protein! If babies only need that much then we certainly are okay! So might as well just eat more carbs and less protein 🙂