it may be important to talk about in context of the eating disorder, it may need to wait. I think that depends on how comfortable you are with him and with talking about it. Even if you do bring it up, you can always change the topic again and put it on the back burner for a while... at least it will be out there... I've omitted stuff at intakes also... it kinda just happens when you don't necessarily trust a person yet, and it's a sensitive topic to boot...