The digestive system is responsible for breaking down the food and drink we consume into usable substances and, transferring them into energy for our body; as well as for cell growth and repair.It consists of a network of organs working harmoniously to achieve the task.On top of harnessing the substances we consume, the digestive system is also responsible for excreting waste from the body. Metabolism is the process that your body uses to convert the food and drink that you consume into energy.The digestive system and body metabolism work together to ensure that your body is consistently and efficiently energized to carry out normal day-to-day tasks, as well as background bodily functions.he digestive system is responsible for breaking down the food and drink we consume into usable substances and, transferring them into energy for our body; as well as for cell growth and repair.