Aging is a natural process, but its effects on the body are often very noticeable in daily life. One of the most clinically significant changes is the decline in muscle mass and function, which in older adults is characterized by weakness when standing up from a chair, slower walking, rapid fatigue, and an increased risk of falls. This condition is often associated with sarcopenia—a progressive muscle disorder that affects independence, quality of life, and the burden on healthcare. In many guidelines, physical activity (particularly resistance training) remains the primary therapy. However, nutritional interventions, especially increased protein intake, also play a major role as the building blocks for muscle formation and maintenance.