what is The relationship between burning food outside the body and food reacting with oxygen inside the body is ​

Your body cells use the oxygen you breathe to get energy from the food you eat. This process is called cellular respiration. During cellular respiration the cell uses oxygen to break down sugar. The main focus of this lesson is to review the basics of respiration (breathing) and to teach students the importance of oxygen to the human body. To burn food for the release of energy stored in it, oxygen must be supplied to cells, and carbon dioxide removed.