Muscle strength, muscle mass, and performance are important parameters for health – a loss of these is characteristic of sarcopenia, which is no longer found only in older or slim individuals. The factors influencing sarcopenia are strongly dependent on lifestyle – even in children and young adults – as well as the use of medications such as GLP-1/GIP receptor agonists. The lecture will focus on how sarcopenia can be (early) detected and countered through diet and nutrition.