Which nutrient is primarily responsible for building and repairing body tissues?

Proteins are primarily responsible for building and repairing body tissues because they are made up of amino acids, which are the building blocks of various structures in the body, such as muscles, skin, organs, and enzymes. When you consume protein, your body breaks it down into amino acids, which are then used to create new proteins or repair damaged ones. This is crucial for growth, recovery from injury, and overall maintenance of bodily functions.

In contrast, carbohydrates serve mainly as a source of energy for the body, fats are important for energy storage, hormone production, and cellular structure, while vitamins play key roles in various biochemical functions and are crucial for health but do not function directly in the building and repair of tissues.