Read On The Fox News AppAdvertisement AdvertisementResearchers highlighted three essential amino acids that are building blocks of protein — methionine, isoleucine and valine. For active individuals, the dietary amino acids associated with protein intake are crucial for building muscle tissue. Exercise helps to direct dietary amino acids toward building and repairing muscle instead of leaving excess amino acids to be processed by the body, the researchers noted. Advertisement AdvertisementTest Yourself With Our Latest Lifestyle QuizHigh protein intake is also crucial for pregnant women and older adults who may face age-related muscle loss. Original article source: Living longer could hinge on one surprising dietary change, study review suggests