2. The dietary fiber rich in salad is indispensable for a healthy diet. Fiber plays an important role in keeping the digestive system healthy. At the same time, taking enough fiber can also prevent cardiovascular diseases, cancer, diabetes and other diseases. Fiber can clean the digestive wall and enhance the digestive function. At the same time, fiber can dilute and accelerate the removal of carcinogens and toxic substances in food, protect the fragile digestive tract and prevent colon cancer. Fiber can slow down digestion and excrete cholesterol as quickly as possible, so it can control blood sugar and cholesterol at the best level.