What nutrient is essential for building and repairing cells and tissues?

Protein is essential for building and repairing cells and tissues because it is made up of amino acids, which are often referred to as the building blocks of life. When the body undergoes growth, healing, or maintenance, protein plays a critical role in these processes. It contributes to the structure of muscles, skin, organs, and other tissues, and is vital for the function of enzymes and hormones. Without adequate protein, the body cannot effectively repair damaged tissues or develop new cells, leading to impaired healing and growth.

Other nutrients have important functions: carbohydrates serve primarily as the body’s main source of energy; fats are crucial for energy storage, hormone production, and cell membrane integrity; while vitamins support various biochemical processes but do not directly contribute to the structural components of cells and tissues in the way protein does. Thus, protein stands out as the nutrient specifically required for the processes of cell and tissue growth and repair.