Hello, spaghetti needs a lot of carbohydrates as raw materials to grow muscles. More importantly, carbohydrates fundamentally enhance the efficiency of protein's metabolism, allowing the intake of protein to enter the muscles to help growth. In other words, without carbohydrates, the protein you absorb will not be well used for muscle growth. A cup of cooked macaroni contains about 45 grams of carbohydrates, which is at least what a person who is hard to gain weight needs for every meal.