A friend of mine decided to "fast" because of poor self image, which I identified as symptoms of Anorexia-Nervosa, and I have identified the problem with her and got her in a willing state to try and reform to a healthy eating pattern, the problem is her body is rejecting any and all food she consumes.
I would recommend your friend see a GI specialist as soon as possible. In fact, I would go to the emergency room. This kind of malabsorption can cause dehydration, which can be fatal, especially in someone whose body is already compromised by AN.
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