The 22-year-old singer admitted that she was motivated to lose weight when she began to get ill.
She told the August 2012 issue of America's Shape magazine: ''I just wanted to be healthy. I knew I had a long road ahead of me. I was barely working out, and my diet was a mess.''
She also opted out of late night dinners in hotel rooms and replaced them with healthy options like Smartfood popcorn and sauteed turkey breast with steamed carrots.
The 'Sparkle' star also controlled portion sizes by making sure her meals fit onto a normal sized plate.
Her final step was making sure that she stopped eating two hours before bedtime.
But she found it a struggle being energized to exercise.
She confessed: ''I had to start gradually. Soon I was able to shift to a more challenging pace and go hiking in the nearby mountains. The weight really started falling off. It was awesome.''
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