I have a niece who is literally obese (>30 BMI) and her mother (also obese, even more so) frequently describes her daughter as a "healthy eater" despite the fact that her diet mainly consists of cake and ice cream, in enormous amounts. She considers it "healthy" because it's all organic from Whole Foods.
I honestly don’t care what food it is. If all you eat in a day is quinoa, that’s unhealthy. It’s not the food, but eating just one food type in a day is unhealthy.