Is it possible for human body to convert carbohydrates to protein?
Essential amino acids cannot be synthesized from carbs, but non-essential amino acids can be synthesized. Intermediates from the citric acid cycle or pyruvate can be used to synthesize at least 11 kinds of non-essential amino acids. They will be incorporated into muscle, but you need all the essential amino acids available in order to produce complete proteins that will build muscle tissue. Proteins are made from the entire repertoire of amino acids, and I don't think there exist any (perhaps very, very few, none to my knowledge, *I've checked the literature) that are made from only non-essential acids.