Cellular Metabolism Each time you fuel your body with food, your digestive system breaks down the proteins, ready to be absorbed by cells, and then change them into even smaller pieces to become energy in a process known as metabolism. During metabolism, chemical bonds are broken and energy from electrons are produced. Last Update: May 11, 2019 October 24, 2018 2113Technical DocumentsRelated Knowledge Base Posts -Pepti-LiftPepti-ToneRejuvenator or Retinol