Potato is a plant. The fleshy part of the root (potato) is commonly eaten as a vegetable. Potato is also used to make medicine.People take raw potato juice for stomach disorders and water retention (edema). A purified protein powder made from potato is mixed with water and used to control appetite for weight loss.Some people put raw potato directly on the affected area for arthritis, infections, boils, burns, and sore eyes.In foods, potato is eaten, used as a source of starch, and fermented into alcohol.