There is a lot of dangerous misinformation in this thread.
I have had a diagnosed eating disorder for over half my life, and my entire adult life. It started off as anorexia nervosa, restricting type, and over the years I have had phases of atypical anorexia, compulsive exercise, anorexia - binge purge type, EDNOS, all punctuated by relapses into AN-R.
Eating disorders are not simply diets taken too far. Body dysmorphic disorder is not just hating your thighs or the way your butt looks in jeans. There are neurological and biological aspects to the disease that are incredibly powerful. Vanity has nothing to do with it for the vast majority of ED patients. Read more here: http://www.ryandoesresi.com/2015/08/...want.html?m=1#
Your wife needs to be properly diagnosed and evaluated for treatment. Eating disorders are the deadliest mental illnesses. And recovery is a long and difficult process. It's nowhere near as simple as "just eat."
IMO, if your wife's stats are that severe and have been for any length of time, it's time for a true intervention. Tell her how her illness is affecting you. Be completely honest; do not protect her feelings. Tell her if things don't improve you will need to divorce so that you can be in a relationship with someone whose primary relationship is not with food, but with you. She will have to hit rock bottom to want recovery.
Do not, under any circumstances, take her to just a nutritionist or social worker for diagnosis/therapy. If her schedule allows it, intensive outpatient (3 hrs per day x 3x/wk) or partial hospitalization (9am-2 or 3pm Monday through Friday) have been transformative for a number of people I know, but many of us really need inpatient. I personally can't do inpatient as I'm the primary breadwinner and my employer is too small to be forced to offer short term disability / medical leave, but at this point, I would cut off my own left hand to be able to do inpatient.
There's so much more I could say but this is long enough already.
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