Whole foods are those that are unprocessed and unrefined, or processed and refined as little as possible before being consumed. They typically do not contain added ingredients, such as sugar, salt, or fat.

Often confused with "organic food" (i.e., organically-grown food), whole foods are not necessarily organic, nor are organic foods necessarily whole, although they do share a number of traits, such as an avoidance of chemically-assisted agricultural techniques. Because of the lack of basic processing, many whole foods have a very short shelf life and are not easily sold outside of farmers' markets.
http://en.wikipedia.org/wiki/Whole_Foods