I think that you can tell people the truth about foods without tagging on the “fat bogey man” message, and that it would be both more ethical and more effective. Suggesting that part of the population should make choices in an effort not to look like another part of the population is highly problematic and creates an environment where people are encouraged to stereotype and shame others for how they look which isn’t super healthy for anyone. Also, there aren’t separate healthy and unhealthy foods for fat people and thin people. If someone believes that a food is not healthy, then it’s not healthy for anyone. It’s not as if highly processed chemically manipulative foods are healthier for people who can eat tons of it and not gain weight. I think that an effective public health message would be to let people know that companies are trying to manipulate their brain chemistry to make them buy more food, and let them decide if that’s ok with them, not tell them not to eat this food because it might put them into a class of people who are being actively stigmatized and oppressed, thereby reinforcing that stigma and oppression.