Two quick references: Hilde Bruch's The Golden Cage (pub. 1978) is a pretty representative book for the time - the reductive summary is about over-controlling mothers and type-A daughters. She also wrote in 1973 "Eating disorders; obesity, anorexia nervosa, and the person within". You might want to read the relevant portions of Joan Jacob Brumberg's Fasting Girls as well.

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It also depends what type of treatment - broadly speaking psychoanalytic (Bruch) and medical (hospitalize, refeed, discharge, repeat - look at Karen Carpenter for the kind of trajectory that has). Later in the 1970s, more so in the 1980s, Orbach etcetera discuss weight as a feminist issue. (eg On Feminism and Psychoanalysis—In the Case of Anorexia Nervosa - Young-Bruehl, Elisabeth).

Could also throw in cultural factors -- eg ‘Culture’ in culture-bound syndromes, Caroline Giles-Banks.

FBT/Maudsley based on Minuchin's work comes at the end of the decade and takes a while to be established: see LeGrange.