She's since spoken openly about her troubles, and Lovato - who released her third album Unbroken last year (11) - is doing all she can to combat her issues.
As a result, the star is steering clear of any new movie projects for fear they could reignite her image issues.
She tells Britain's You magazine, "I know that I could be in a fragile state of mind if I go back in front of the camera; I'm not really confident enough.
"The camera adds 10 pounds and I feel like I have too many tattoos right now to go back on screen. I want to act again if they can find a way to cover my tattoos and one day I'd love to be respected as an actress."