Personally, I think the issue is either gynaecological , or bowel related.
Yes, she’s very very slim, but she also seems to have a lot of energy, and her hair, skin, etc., don’t, to me, look like she has any kind of eating disorder.
I’m not a fan of the Royals and the whole concept of Royalty, given the century were in!
But I sympathise with Kate on this; she should be able to keep her health matters private if she wants to.
I think it’s a bit cruel to be making fb posts about her being treated for an eating disorder, whether true or fantasy.