Hi grey
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Day* they wouldn't tell your dd to stay off school lightly, I think there is a risk that as parents we might try and minimise how serious the illness is, as much for our own anxiety as anything else. I used to tell myself that as long as dd ate once a day she'd be okay, this was obviously nonsense and physically she was in a dreadful state. The Eva Musby book has lots of advice on getting them to the dinner table and literally gives you scripts on what to say to get them to eat.
The first week with my dd was the worst, I set times for breakfast, snack, lunch, snack, dinner and snack. The expectation was she would have to eat at those times. Dd was banned from the kitchen and was not allowed to ask about the food/ingredients etc. In theory you are meant to insist they eat everything on their plate however I played this by ear and would let some things go. To me it's about winning the war not necessarily every battle.
My dd was very resistant and resorted to head banging a few times which was awful but I stayed calm and persistent 'you have to eat this/ this is exactly the right amount/ this is what you need' on repeat.
If any of you watch Stranger things I liken the anorexia to Will being possessed by the alien, you have to make life so uncomfortable for it eventually it will give up and leave. You have to cope with your child's distress and anxiety and know that the distress and anxiety won't hurt them but the anorexia can kill them!
You also need to start ensuring every single bit of food is maximum calories, we are going through tons of butter and double cream, it is added to everything!!!