Ida Mae Astute/ABC

Katie Couric reveals on her show today that she struggled with bulimia from her late teens to her early 20s.

"I wrestled with bulimia all through college, and for two years after that," the talk show host tells eating disorders specialist Cynthia Bulik, according to a transcript of today's show obtained by ABCNews.com.

Couric's revelation comes amid her interview today with pop star and "X Factor" judge Demi Lovato, who has also battled eating disorders.

"I know this rigidity, this feeling that if you eat one thing that's wrong, you're full of self-loathing and then you punish yourself, whether it's one cookie or a stick of gum that isn't sugarless, that I would sometimes beat myself up for that," Couric says on today's show, which airs on ABC at 3 p.m.

Bulik praises Couric for coming forward with her struggle and showing others that it's possible to recover from an eating disorder.

"It's like you can look into the future and someone can say, 'This is possible. Recovery is possible. I can change my thoughts that way.' And just the honesty behind saying, 'Yeah, I do still struggle. And these thoughts do come into my mind sometimes.' But just knowing that you can get past that, and learning strategies from someone who's been there, that's what it's all about in terms of recovery," Bulik says.