This article invites disability scholars to “get fat,” that is, to support the goals of the fat justice movement. I argue that the contemporary politics of fatness can productively be read through the lens of disability studies’ social model. At the same time, I mobilize feminist critiques of the social model to push fat disability studies toward a more in-depth engagement with the topics of health and illness. Additionally, I contend that feminist scholars’ accounts of our personal relationships to fatness (...) and disability can make crucial contributions to our scholarly work. These arguments take shape within a new interpretive framework that I introduce: “setpoint epistemology,” which brings together the feminist disability studies notion of “sitpoint theory” and the scientific concept of “setpoint theory.”. (shrink)