Protein is a vital macronutrient composed of amino acids, serving as the building block for muscles, tissues, enzymes, and hormones. It plays a crucial role in the growth, repair, and maintenance of the body. Essential for all age groups, protein supports childhood development, sustains muscle mass in adults, and promotes recovery and strength in the elderly. It is fundamental for immune function, energy production, and overall health. A balanced protein intake is necessary to meet the body's diverse physiological needs.

Children and teenagers require higher protein intake per kilogram of body weight compared to adults, as protein supports their rapid growth and development. For children, the daily requirement is about 1-1.5 grams per kilogram, while teenagers may need 1-1.2 grams per kilogram. These increased needs ensure proper muscle development, immune function, and overall growth during these crucial life stages. Balanced dietary sources of protein are vital to meeting these needs effectively.

Monitoring protein intake is essential for maintaining health and preventing deficiencies. Individuals with conditions like kidney or liver disease should seek tailored advice from healthcare providers, as excessive protein can strain these organs. Awareness of protein needs is often lacking; understanding personal requirements based on age, activity level, and health status ensures balanced nutrition. Tracking protein consumption helps support growth, repair, and overall well-being while avoiding potential health complications.