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Serum levels (in healthy older subjects) of: (A) leucine (Leu) and essential amino acids (EAA) in response to the ingestion of a low-calorie (150 kcal) casein-based and leucine-enriched whey-protein-based (muscle-targeted) ONS; (B) insulin in response to the ingestion of a low-calorie (150 kcal) and a high-calorie (300 kcal) muscle-targeted ONS (MT-ONS). Adapted from the study by Luiking et al. [39].
