[Problem] to provide a method for promoting expression of a gene related to muscle synthesis, for promoting muscle synthesis, for inhibiting expression of a gene related to muscle atrophy, for inhibiting expression of a gene related to muscle atrophy, for promoting muscle synthesis, for inhibiting expression of a gene related to muscle atrophy, An agent for inhibiting muscle atrophy or inhibiting muscle protein degradation is provided. [Solution] provided is an agent for preventing or ameliorating sarcopenia, which contains GABA as an active ingredient. Selected drawing: Figure 1
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