Quinoa is nutritionally renowned for its protein content and while it does have a decent amount, it’s not actually the amount of protein that’s so impressive. Instead it’s the type of protein. Quinoa has the perfect balance of all nine amino acids essential for human nutrition. This type of complete protein is rarely found in plant foods, though common in meats. Quinoa also offers a good dose of fiber and iron. There are 111 calories in each 1/2 cup of cooked quinoa.