Protein is a crucial macronutrient for overall health, body composition, and brain function. It plays a vital role in building and maintaining muscle mass, which becomes increasingly important as we age due to the risk of sarcopenia. Having stronger muscles is directly linked to better brain health and insulin sensitivity, as well as the ability to dispose of glucose effectively. Additionally, protein is highly satiating and aids in appetite control, making it beneficial for weight loss. It serves as the building blocks for muscle growth and is essential for anyone looking to change their body composition. So, whether you're aiming to lose weight or build muscle, prioritizing protein intake is key.