Which nutrient is made up of amino acids and is referred to as the body's 'building blocks'?

Proteins are essential macronutrients that are made up of long chains of amino acids. These amino acids serve as the fundamental building blocks for a wide variety of physiological functions in the body. They play a critical role in the structure, function, and regulation of tissues and organs.

When consumed, proteins are broken down into their constituent amino acids during digestion, which are then used to build and repair tissues, produce enzymes and hormones, and support immune function. This characteristic of proteins is particularly important in growth, recovery, and overall health, making them vital for both physical fitness and wellness.

Carbohydrates, while important for energy production, do not provide the essential building blocks for body structures. Fats serve as energy sources and play roles in hormone production and cell structure but do not function in the same structural capacity as proteins. Minerals are essential for various biochemical processes but do not serve a structural role in the way that proteins do. Hence, proteins are recognized as the body's 'building blocks' due to their vital role in the maintenance and growth of bodily structures.