I'm very pleased the majority of these comments are describing the nuance. People will read the title and think the disorder is about "what is being eaten" rather than "why it is being eaten". In this case healthy food it the object of obsession, which could be replaced with anything. This disorder has a higher rate and frequency, which can lead to a specifically defined item in the DSM V (VI if it is added), bringing awareness and guidance to therapists (as well as socioeconomic benefits).  All that being said, this will be skewed by whales saying that eating healthy is a psychological disorder, science is always misunderstood with the distortion touted as truth (see: Homepathy,  Phrenology, and Chiropracty. You should immediately respond saying, "Yes, it is a shame that obsessive disorders do occur leading to detrimental health effects in the same way someone can be obsessed with unhealthy food and become fat; but say the second half in a slower tone it causes the brain to perceive it as more important and reflect on it for a greater period of time. Either they disagree with the statement, accept they have a disorder, or understand they are normal and are simply a lazy fuck.