Ranch dressing is an American condiment. The dressing is made of buttermilk or sour cream, mayonnaise, minced green onion, garlic powder, and other seasonings mixed into a sauce. Ranch dressing is one of the top two styles of salad dressing in the United States, together with blue cheese.
In 1954, Steve and Gayle Henson opened a dude ranch near Santa Barbara, California, and named it "Hidden [i]Valley Ranch". As a side business, they sold to guests a special dressing that Steve had developed in Alaska. The dressing was popular, and they began selling bottles that guests could take home, and later opened a factory to sell packets of ranch seasoning that had to be mixed with mayonnaise and buttermilk (packets that are still available to this day). In 1972 the brand was bought by Clorox for $8 million.
Clorox reformulated the dressing several times to try to make it more convenient. The first change was to include buttermilk flavoring in the seasoning so that home chefs only had to add milk rather than buttermilk. In 1983, Clorox developed a non-refrigerated bottled formulation, making it even more popular.
In much of America, ranch is a common dipping sauce for things like french fries, chicken wings and other fried foods. This spread to other regions has been attributed to Denny's offering it as a choice with their meals for over two decades nationwide.[/i]
Anyway here's what that famous or infamous source wikipedia, with me only slightly editing out the non-essnetial parts, has to say on the matter of ranch dressing. Since, well according to them it's up there with blue chesse, I'd say it's that creamy fattness that makes most go gaga, well that and a few millenia of genes attuned to deprivation.