Hey hun,
I just gave this link out in another post but I think it can help you too. Perhaps you could direct them to SomethingFishy's (
http://www.something-fishy.org/) advice section for people trying to support someone with an ED. It's got alot of great information, how to help, what to/not to say etc. It's a really helpful website.
It's hard for parents to understand how someone with an ED hears and sees things Just try and explain gentley that comments about weight don't help, and even though you are so grateful for their love and support right now, it is better to keep their supportive comments away from weight and size.
Hope I helped in some way, take care of yourself, I'm so glad your parents are supporting you through this.
xxxx