Confession time: I'm a dietician, and I hate the term "eating clean." That's right, hate. Though this particular turn of phrase has been around for decades, it has catapulted in recent years, thanks to an ever-more-vocal community of fitness enthusiasts who stick their noses high in the air while preaching a million different—and often conflicting—definitions. You wouldn't think two words could have so many definitions, but "eating clean" is persistent to the point of being unkillable.