
Keywords: Muscle mass; Glycine; Nutrition; Calorie restriction; Fat mass; ALA; alanine; Atf4; activating transcription factor 4; AUC; area under the curve; Bnip3; BCL2/adenovirus E1B interacting protein 3; Ccl2; chemokine(C-C motif) ligand 2; Ccl5; chemokine(C-