Fruits and vegetables also supply vitamins and minerals to the diet and are . Fruits contain mostly sugars and fibers, such as pectin, that are. Pectin is a type of fiber found in some fruits and vegetables. Fruit pectin can also be used to thicken foods like jams or puddings and is available in a liquid or. Pectin is a type of water-soluble fiber found in a variety of fruits and vegetables. Commercially, it's used to make jams and jellies because it turns into a sticky.