The "Great Chain of Being" reasoning is very dated. Humans are not on top of the food chain. Even Darwin recongnized that.
Also, you are wrong to assume that only overweight people want to cleanse.
I do feel bad that you got attacked for suggesting a milk diet, but don't resort to mud slinging, please.
I am really trying to be helpful when I suggest that if you are severely underweight, you should look into the parasite cleanse.