Everyone knows the difference between dirty and clean foods, so I don’t have to explain the obvious…or do I? My favorite response to questions about how to eat clean is, “Wash your food.” The biggest problem with discussing foods in these terms is that there’s no clear definition of clean or dirty. The difference might seem obvious, but a closer look shows that it’s far from clear-cut. The confusion is compounded when clean eating is preached as the best way to optimal health and body composition.