Planters: Instinctively Good

I get how this slogan ties into the commerical (remember the woman with the unibrow who rubbed a cashew on her neck and wrists and drove the guys wild?) I don't get what it has to do with nuts, though. What makes a cashew instinctively good? What do instincts have to do with snacking? A slogan shouldn't make you think this hard. All these questions will drive you plain nuts.