Abigail Alger at Reformer's Blog has a good article on "Why Fat Studies (and All Identity Studies) Hurt Higher Education":
But Fat Studies, like all identity studies, begins with the end in mind. The conclusions have already been determined: fat people are oppressed and down-trodden, victims of an insert-terrible-adjective-here system and insert-another-terrible-adjective-here society. In a closed system like this, there can be no debate or disagreement.
NAS's own Glenn Ricketts is quoted on the emergence of fat studies here.