The primary role of protein in the diet is to provide essential amino acids, which are necessary for various bodily functions. Proteins are vital for building and repairing tissues, producing enzymes and hormones, and supporting proper immune function. They also play a crucial role in muscle development and maintenance. Inadequate protein intake can lead to deficiencies and adversely affect growth, tissue health, and overall well-being. Consuming a balanced diet with sufficient protein from sources like meat, fish, dairy, legumes, and nuts is essential for optimal health.