Potatoes are the fourth most important food crop in the world. There are many kinds of food made with potatoes. For example, we often eat shredded potatoes, potato chips, mashed potato chips and other foods. Potatoes have a good sense of satiety after eating, and are the most complete vitamin content of all food crops. Do you know how potatoes are transformed into deep fried frozen fries in factory? What's the secret to McDonald's fries?