Which nutrient is primarily responsible for building and repairing tissues?

The nutrient primarily responsible for building and repairing tissues is proteins. Proteins are made up of amino acids, which serve as the building blocks for the body's cells and tissues. This makes them essential for growth, maintenance, and repair of tissues, including muscles, skin, and organs.

Proteins play a crucial role in various bodily functions beyond tissue repair, such as producing enzymes and hormones. The body constantly undergoes wear and tear, and proteins are vital for repairing damaged tissues and supporting overall health. This is particularly important for individuals who are physically active, growing, or recovering from illness or injury, as their bodies require more protein to facilitate healing and recovery.

In contrast, carbohydrates primarily serve as a source of energy, fats provide essential fatty acids and support cell structure, while vitamins play roles in various biochemical processes and support overall health but do not directly contribute to tissue repair. Hence, proteins are the key nutrient when it comes to building and repairing tissues in the body.