Cristina Hanganu-BreschPhiladelphia, Pennsylvania, USA As numerous social and traditional media outlets and ads constantly remind us, our diets must be “clean”—a vague descriptor whose fuzzy boundaries can fit a plethora of surrogate terms: organic, natural, whole, non-GMO, unprocessed, gluten free, vegan, sugar-free, fat-free, low-carb, raw, unrefined, and so on. The evidence for “clean eating” is…