Actress Diane Keaton has opened up about her secret battle with bulimia, revealing she gorged on 20,000 calories a day.

The Oscar winner began struggling with the eating disorder in her 20s after dropping 10 pounds to star in Broadway musical Hair, and she battled the disease for four years.

Appearing on American talk show The Dr. Oz Show on Friday (09May14), Keaton revealed the extent of her binge eating, insisting a typical evening meal for her consisted of "a bucket of fried chicken, several orders of fries with blue cheese & ketchup, a couple (of) Tv dinners, a quart of soda, pounds of candy, a whole cake, and three banana cream pies."

She adds, "It was horrible. It was, of course, the lowest point of my life... I was a fat person, I was an obese person, who had somehow tricked myself and managed to hide it. So when you're living with a lie for four years (sic). All I did was feed my hunger, so I am an addict. It's true. I'm an addict in recovery, I'll always be an addict. I have an addictive nature to me."

The Annie Hall star beat the disorder after spending a year seeing an expert, and now says she channels her addictive personality into her work and raising her children.