DIGESTIVE SYSTEM W H AT I S T H E DIGESTIVE SYSTEM? The digestive system is when your body gets nourishment and energy. It is the group organs that break down food in order to absorb its nutrients. THE FUNCTION THE FUNCTION OF THE DIGESTIVE SYSTEM IS DIGESTION AND ABSORPTION. DIGESTION IS THE BREAKDOWN OF FOOD INTO SMALL MOLECULES, WHICH ARE T H E N A B S O R B E D I N T O T H E B O D Y. I T P R E PA R E S F O O D T O B E U S E D B Y THE CELLS BY BREAKING IT DOWN.