Your digestive tract is a twenty-five- to thirty-five-foot-long engineering marvel. It takes food, chops it up, breaks it down, separates the good from the bad and extracts nutrients so they can be delivered to the body. But if just one component of your digestive system malfunctions, it can lead to problems. Fortunately, the fiber in homemade juice adds bulk to stool and sweeps away harmful toxins. The water helps lubricate the digestive tract, while the many healthful nutrients in juice promote digestive health.