What is sarcopenia?What are the main signs and symptoms of sarcopenia?How is sarcopenia diagnosed?What are some of the main medical treatments for sarcopenia?Have any supplements been studied for sarcopenia?How could diet affect sarcopenia?Are there any other treatments for sarcopenia?What causes sarcopenia?What are the cut-off points for diagnosing sarcopenia?When do age-related declines in muscle mass and strength set in?How is sarcopenia distinguished from other conditions?Does protein source matter?What are the benefits of resistance training?