Did you know that every single cell of our human body is composed of protein? All thanks to protein, we have well-defined structures in our bodies, thus the reason we refer to them as life’s building blocks. The macronutrients are everywhere; in our bones, cells, tendons, muscles, enzymes, blood, hormones, neurotransmitters, and other structures. Proteins consist of amino acid chains. There are three categories of amino acids, namely, essential, nonessential, and conditional amino acids. Our bodies receive essential amino acids from the food we eat because they do not have the capacity to manufacture them. The body can manufacture nonessential amino acids from the essential amino acids supplied via food or during protein breakdown. Conditional amino acids are needed during certain conditions, such as adversity, stress, and illness.