Eating habits

I just don't get how CP can have such terrible eating habits but don't gain weight. I know that all metabolisms work differently but I watched the donuts in Evie's birthday video and gained weight haha. In all seriousness though, the junk eating may not affect their outsides but for sure it's affecting their insides. The high sugar is what really gets me. I hope all are having regular health checks to ensure they get all required nutrients.