All varieties of fruits and vegetables contain fiber in it. It is that part of the food which cannot be broken down by the enzymes present in the digestive tract. Fiber passes through the tract without being absorbed. They have a cleansing effect on the intestine and keep the digestive tact clean. A diet rich in fiber is a protection against various diseases that can affect us. It helps prevent heart disease, cancer of the colon and rectum, varicose veins, hemorrhoids and obesity. Intake of food rich in fiber can do wonders in a weight loss program and help stay healthy.