Acorn is a nut of an oak tree with a hard outer covering, topped by a cupule. For thousands of years, acorns have held an important position in human diet but still this super-food is not used widely. After extensive research it has been found that acorns are fit for human consumption, and in fact, are loaded with various vitamins and minerals. Acorn is also called ''functional food'' because it provides health advantages beyond the traditional nutrients that it contains.