Terami wrote:
I have a 19 yr old son (diagnosed pdd-nos when he was 3) who stopped eating, he says it just doesn't feel right to eat and he's terrified if he eats he's going to regret it. He's developed an attachment to his food and how its arranged on the plate or in the cupboard and he doesn't want to mess it up, he also is seeing it as something he's bonded with. Has anyone had this happen, I'm so worried about him

Get him multivitamins with trace elements & minerals, get him some tonic drinks/supplemental drinks that are for boosting weight. Make a GP appointment or talk to any therapist he is seeing as they need to tackle this asap.
You could try getting him interested in food by getting him to help you prepare it and encourage him to distract himself with hobbies or interests that take his mind off food.
Sorry I don't have more ideas, I would be terrified if my child did that too.
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*Truth fears no trial*
DX AS & both daughters on the autistic spectrum