AN ORAL NUTRITIOUS COMPOSITION COMPRISING: (A) THREE BRANCHED CHAIN AMINO ACIDS, THE BRANCHED CHAIN AMINO ACIDS BEING VALINE, LEUCINE AND ISOLEUCINE OR (B) A MIXTURE OF UNBRANCHED CHAIN AMINO ACIDS AND THE THREE BRANCHED CHAIN AMINO ACIDS VALINE, LEUCINE AND ISOLEUCINE WHEREIN THE BRANCHED CHAIN AMINO ACIDS ARE NOT GRANULATED AND HAVE PARTICLE SIZES SUCH THAT 10 WT% OR LESS THEREOF PASS THROUGH A SIEVING MESH HAVING 106-µm OPENINGS.