Which of the three macronutrients form the enzymes critical to the thousands of chemical reactions required to sustain life?

Proteins, which are one of the three macronutrients, form enzymes that are critical for the thousands of chemical reactions necessary for sustaining life. Enzymes, which are specialized proteins, act as catalysts to speed up biochemical reactions in the body. Without these enzymes, many vital processes, such as digestion and metabolism, would occur too slowly to support life.