How is glucose broken down?

Enzymes. The first step in breaking down glucose is an enzyme called glucose-6-phosphate dehydrogenase. There are then a number of steps regulated by enzymes and the eventual result is carbon dioxide and water.
Glucose metabolism. After digestion, food is broken down to glucose in the gut by digestive enzymes. It is then absorbed into the bloodstream. Glucose is carried in the blood to every cell of your body. Cells need glucose for their energy needs. To get inside the cell, glucose needs insulin's help. .