Published Wednesday, 10 October 2012
Davis, who starred in the UK version of The Office, has previously admitted she suffers from issues with food, but now she has laid bare her battle with anorexia and bulimia in a new open letter, published in British newspaper The Sun.
The star revealed she used to starve herself for days before devouring a week's worth of meals in a single sitting, and once feared her eating disorders had driven her "truly insane".
She wrote: "By the start of 2011, I started bingeing more and more. I couldn't get through a day - even half a day - without bingeing.
"Then, one day in February 2011, I was in a London hotel room and binged on a huge amount of food. I started crying, fell to the floor and let out a sort of scream. I was desperate - and I thought I was truly insane.
"I couldn't believe food had me in its grip like this. The idea of bringing it back up came into my head. I'd never done it before, but all I could think of was getting this food out of me.
"I was unprepared for the high that came with it. It was a powerful addiction. And I told no one.
"A few months later, I woke with burst blood vessels in my eyes after purging the day before."
Davis joined an Overeaters Anonymous (OA) group after her brother confronted her about her condition, and insists she now has a much healthier attitude towards her weight.
She added: "I went to an OA meeting and got a sponsor, someone who has had an eating disorder and helps with the 12 Steps. I went to five meetings a week - and still do. I admitted to myself and others I was anorexic and bulimic.
"I started to feel less ashamed and guilty. My recovery does not make my life perfect but it has given me a different set of eyes with which to see everything. I don't know what I weigh now. I just ask my doctor to let me know if he is happy with what I weigh."