digestion
thousands of cheical reactions take place during digestion. As soon as put food in your mount,an enzyme in your saliva called amylase starts to break down sugars nd other carbohydrates into simpler forms your body can absorb.Hydrochloric acid in your stomach reacts with food to break it down, while enzymes cleave proteins and fats so they can be absorbed into your bloodstream trough the wall of the intestines.