Wikipedia is an encyclopedia collaboratively edited by volunteers from around the world built on the Web since 2003. Today is the sixth most visited site on the Internet, making it the biggest hit of participatory democracy in the field of information dissemination. The English edition, with more than 3 million items, has become an indispensable part of the Internet and the largest and most popular reference work. In this context, it could be argued that Wikipedia is a valuable tool for the general knowledge of the nutritional sciences terminology. At the same time, it does not only facilitate access to knowledge but also can generate it. It also permits to socialize these spaces for collaboration and development, contributing therefore to disclose science to the society. Consequently, in this article we present and discuss the main features of Wikipedia, emphasizing above all its role in food science and nutrition.