Demi Lovato has been open and honest about her struggled with an eating disorder as well as drug and alcohol use, but the X Factor judge admits fans would be shocked to learn just how far she took it before getting help in 2010.

Lovato is writing a tell-all memoir about her journey to sobriety and she admitted in the print issue of EW’s Nov. 15 issue that she’s “battling” with how much she should reveal.

“I'm battling with internal thoughts on how honest I should be. "Yes, I've been very honest, but if people really knew how dark and deep my struggles got -- not just with my eating disorder but with drugs and alcohol -- they'd be really shocked,” she explained. “But I'll most likely end up saying everything. Maybe it'll help other people in the industry who are headed down the wrong path."

Lovato has been asked about her former fellow Disney star, Miley Cyrus’ recent behavior and she was once again asked about it.

"She's having fun and figuring out who she is, and this is the age when that happens. I think that… she's doing her own thing. Good for her,” Us Weekly reports.

The “Skyscraper” singer has a book of daily affirmations called Staying Strong: 365 Days a Year coming out Nov. 19.

image: FOX