The invention pertains to a composition for stimulating muscle strength in elderly, comprising whey protein, free BCAA and probiotic bacteria, wherein the composition comprises one or more free BCAAs selected from the group consisting of leucine, isoleucine and valine, and at least 50 g whey protein per 100 g dry weight of the total composition. Also, the invention pertains to a composition additionally comprising one or more dietary fibers selected from the group of pectins, pectates, alginates, fructans, fructooligosaccharides, indigestible dextrins, galactooligosaccharides, xylooligosaccharides, arabinooligosaccharides, glucooligosaccharides, mannooligosaccharides and fucooligosaccharides, and to the use of such composition in dietary management of malnutrition of elderly.