LONDON, ENGLAND - FEBRUARY 24: Jade Thirlwall, Perrie Edwards, Leigh-Anne Pinnock and Jesy Nelson from Little Mix attend the
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Jade Thirlwall is talking for the first time about battling anorexia as teenager.

The Little Mix member detailed her eating disorder in the band's new book Our World, which was released today. In a segment, the 23-year-old revealed that her battle began at age 13 while going through a particularly troubling time in her personal life. The Mirror shared one particularly heartbreaking passage:

LONDON, ENGLAND - FEBRUARY 05:  Jade Thirlwall of Little Mix performs on stage at The O2 Arena on February 5, 2016 in London,
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"My periods stopped and things were getting out of control but I don't think I really cared about what was happening to me. I felt so depressed at the time that I just wanted to waste away and disappear.

Anorexia is a self-destructive thing and you become stubborn, so when people are trying to tell you something you get it into your head that they’re against you and you’re not going to listen...It took going to hospital to make me realize that it wasn’t a game, it was something really serious. They sat me down in the clinic and were quite tough at first, spelling it out: 'You're destroying your body and if you keep doing this you will die.'"

But there's a happy ending, as Jade says she battled her eating disorder with therapy, regular hospital visits and by surrounding herself with friends who care about her—which now includes her band mates!

Our World is available now, released on the heels of the band premiering their saucy new single "Shout Out to My Ex" which, by the way, is way more than a breakup anthem. Get your #TBT on with a classic Little Mix interview at Fuse HQ when the girls were just starting out below: