A growing number of companies are testing muscle-building agents to counter the side effects of dramatic weight loss and potentially to preserve lean muscle into old age.

中文翻译：

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减肥药取得成功后，公司纷纷努力保护骨骼肌

越来越多的公司正在测试增肌剂，以对抗体重急剧下降的副作用，并有可能在老年时保持瘦肌肉。