How did they both wind up with the same diagnosis?
Ken Seeley, author of "Face It and Fix It": The competition was so extreme that it took on many signs of OCD. The family enabled them by not identifying them as two daughters. When you have an upbringing like that, it can turn what might be a mild imbalance into a stronger illness.

The girls left college and the family allowed them to move back home and let the illness progress. By not taking drastic measures, the parents were showing that it was OK.

They were craving desperately to create their own identities -- Julia even had darker hair and Sonia's was cut shorter. But they didn't have the tools to get out.

Do families always play such a major role?

KS: Any time you tolerate an unhealthy behavior, you're contributing to it. The twins' parents had to change their behavior and say, "This is no longer acceptable within our family."

I've worked with clients who thought drinking or their temper was fine because they were Irish or Italian. I've worked with people who never realized they had anger issues because everyone around them always apologized for upsetting them.

Your book talks about identifying what you call Life-Imbalancing Behaviors (LIBs). Does everyone have an LIB?
KS: If you go to bed at night and have some form of depression, sadness or pain, or you just feel like something's missing from your life, you're in denial about some sort of LIB that you're not dealing with. If you can balance that out, you'll live a happier, healthier life.

Click Next to find out how the twins are doing now.


More from around the web:
How to help a friend with an eating disorder (College Candy)
Famous folks who have twins (Mental Floss)
Kristin Chenoweth sings an intervention (Urlesque)