Lettuce (Lactuca sativa) is an annual plant of the daisy family, Asteraceae. It is most often grown as a leaf vegetable, but sometimes for its stem and seeds. Lettuce is most often used for salads, although it is also seen in other kinds of food, such as soups, sandwiches and wraps; it can also be grilled. Lettuce is, arguably, the most popular diet food out there. This green leafy vegetable is typically eaten with sandwiches, salads, tacos and dishes common to the Chinese. It comes in various forms, such as butterhead, loose leaf, Chinese, summer crisp, crisphead, and romaine.