Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Fast food is an umbrella term given to all types of food with preheated or precooked ingredients, which can be prepared and served very fast. First introduced in the early 1900s, fast food is described today as a universal solution for under pressure situations , having low prices and being easily accessible almost everywhere. Recently, according to new research on fast-food menu information in several countries, US fast foods turned out to have a higher salt level than in other countries at a time when all over the world the importance of a salt reduction strategy designed to keep world population healthier is highlighted.