The DSM is the standard manual used by psychiatrists for the diagnosis of mental disorders. Psychiatry has been subject to several criticisms1. For example the american sociologist Thomas Scheff applied the labeling theory to psychiatry and concluded that certain visions or ideologies have been labeled as deviants, when of course the labeling was made from the point of view and values of the majority. Similarly, Foucault, after an analysis of how attitudes towards those deemed "insane" have changed as a result of changes in social values, has argued that psychiatry has primarily been a tool of social control2.
With these premises it wouldn't surprise me that in some moment veg*ism has been or might be included as or related to a mental trouble. So, does the DSM make any reference to veganism or vegetarianism?