If more people really thought about how much their digestive systems do for them every day, they might be more inclined to take better care of their digestive health. Your digestive system has a huge job – it breaks down the foods that you eat in order to make nutrients and energy available to the body, and it is responsible for steering unwanted waste out of the body, too. On top of that, your digestive tract is a key player in immunity – the cells lining your digestive tract help protect your body against bacterial and viral invaders that could make you sick.