The former Pussycat Dolls star revealed her past issues with food in 2012, and now she has detailed the extent of the eating disorder.
In a new interview with Cosmopolitan magazine, she explains how the "horrible, paralysing disease" left her so weak, she would be discovered out cold by her management.
She finally decided to take action when her illness started to affect her vocal talents.
Scherzinger tells the magazine: "I had such a great life on the outside, the Dolls were on top of the world, but I was miserable on the inside.
"It is such a horrible, paralysing disease and it was such a dark time for me. I didn't think anyone knew in my group or in my family because I hid it that well, I was so ashamed. I knew it wasn't normal or healthy because I was hurting myself through this cycle of disordered eating.
"I had started losing my voice, I couldn't sing at shows, and then I remember my manager finding me passed out on the floor in Malta or in the south of France.
"I thought, 'I'm going to lose everything I love if I don't love myself'... I'm never letting that happen again; you only get one life."