The 21-year-old American Idol alum said all she could think about was to loose weight and look thin, reported People magazine.
"I had bulimia for a few years. I was really sick. I don't know that person - I can't believe that was me. I just desperately wanted to be thin. That's all I thought.
"I was obsessed with it, which it was ridiculous because I had everything going for me. I was following my dream. Everything I wanted at the time, I was getting. But I was obsessed with this other thing that was making me unhappy," Alaina said.
"My mom made me look in the mirror every day and say three things that I loved about myself. At first, I couldn't name anything. It was so sad. When my mom made me do that, I looked in the mirror and I literally couldn't name one thing that I loved about myself," she said.