SarcopeniaCachexiaMuscular AtrophyMuscle, SkeletalAgingWasting SyndromeMuscle StrengthMuscle WeaknessAnorexiaAppetite StimulantsHand StrengthIndependent LivingBody CompositionFrail ElderlyMyostatinBody WeightMuscular Disorders, AtrophicMuscle ProteinsElder Nutritional Physiological PhenomenaMuscular DiseasesMegestrol AcetateGeriatric AssessmentOrgan SizeMuscle Fibers, SkeletalAbsorptiometry, PhotonCaloric RestrictionMobility LimitationAging, Premature