The Manson girls used bulimia as a form of control
When the Family ended up in jail, the girls were not used to being fed three meals a day. Nancy Pitman and Lynette "Squeaky" Fromme were concerned that the women would gain weight and therefore no longer be attractive to Manson.
"We all made a pact that we would throw up our food instead of being forced by our jailers to gain weight," Lake writes. :Nancy made it a regular habit and showed us all how to stick our fingers down our throats to rid ourselves of food. After a while, it became like a rush and a way to control the situation. I knew I would continue the habit even after I was released." Lake started eating regularly again during her time in the psychiatric hospital. She had met someone with anorexia and felt guilty that she was throwing up her food on purpose when her fellow patient had no control over this.