Jesy Nelson has confessed that she has previously "mentally bullied" herself in an effort to please other people.
The 29-year-old singer, who quit Little Mix last year, made the comment in a social media post alongside an image of herself in the gym which she said made her feel "so sad".
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She added: "On the day this picture was taken, I remember going to the gym with my manager and I stood in the mirror and I said, 'god I'm so fat I just want my legs to be like this' and I pulled my skin around to try and create a thigh gap because I genuinely believed that being skinny would make me happier.
"And even when I got to a size 8 from starving myself, I still wasn't happy.
"I mentally bullied myself everyday to try to please other people.
"It's taken me 10 years to realise that I'm the only person I need to please."
Last month Nelson scored her final UK number one with Little Mix after the single Sweet Melody, from their recent album Confetti, topped the charts.
Little Mix formed on The X Factor in 2011 and have become one of Britain's biggest-selling girl bands.
They auditioned on the ITV singing show as soloists, but were placed into a group by judges in the show's later stages.