To The Bone premiered at the Sundance Film Festival earlier this year, where it was hailed for its “honest” depiction of what it’s like to suffer from anorexia.

“It’s not an easy sit, nor a terribly entertaining one, but in the hands of writer-director Marti Noxon, it delivers painful insights in a relatively fresh way,” noted Variety magazine.

The topic was important to Collins, who herself suffered from an eating disorder growing up.

“When I went through my eating disorder, I never sought medical assistance,” Collins told Noxon in her latest interview with The Edit. “I created myths in my head about how I should get through things, so the idea that I could surround myself with truth and feel comfortable enough to speak mine allowed me to breathe.

“There's a scene in the film when we're in group therapy talking about the euphoria we experience — I'd never heard that weird enjoyment we feel from being in the disorder worded that way before — and in that moment, you caught Lily understanding it as opposed to just Ellen, my character.”

Lily Collins reveals she was complimented over weight loss for controversial anorexia film