Carbohydrates. Carbohydrates are the main energy source for the brain. ... <span>Protein. Protein is the major structural component of cells and is responsible for the building and repair of body tissues </span>
<span>Carbohydrates. Carbohydrates are the main energy source for the brain. ...Protein. Protein is the major structural component of cells and is responsible for the building and repair of body tissues. ...Fat. ...<span>Water.</span></span>
