'Nightingale' songstress Demi Lovato has revealed that her trainer and personal chef, Ronny Comacho, is the man responsible for 'kicking her eating disorder's ass.

The beauty shared an image with her followers on Instagram (pictured left) and captioned it with a touching tribute in which she thanks him for being incredibly supportive and motivating:

"For the past 8 months this man has helped me beat my hardest critic: myself. The first day he gave me my meals, that him and his wife cook themselves, he looked me in the eyes and said 'We are going to kick this eating disorder's ass!!!'"

"He was as determined as I was and has been a huge part of my recovery ever since. I've never been happier and healthier and I credit so much of that to this man and his beautiful wife. Thank you Ronny & Elise Comacho for staying up so late to cook my meals and getting up so early to help transform my body but most importantly my mind. You both have truly changed my life."

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Watch Lovato sharing make-up tips below: