Digging into Disordered Eating

What should be done in the case of someone who has been in a quasi-recovered state for years, doesn't actively strive to lose weight, but has deeply ingrained eating disorder habits, as discussed in Episode 188: Ask Erika Holmes MFT and Coping with Eating Disorders? Specifically, what should be done for an individual who is okay with an increasing weight but struggles to accept their body looking different than what they are used to? What about someone who routinely binges at a specific part of the day and cannot stop themselves from purging certain foods that they used to view as 'bad' foods, despite not seeing them that way anymore?