Graham Elliot

Nine months after undergoing weight loss surgery, MasterChef judgeGraham Elliot has already lost 150 pounds.

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The acclaimed chef shared the good news on Instagram, posting a photo of his incredible transformation.

At his heaviest, Elliot weighed nearly 400 pounds, according to People.Elliot opted to have a sleeve gastrectomy in July. He now works out every other day and even says he notices a chance in his personality.

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"I'm more assertive but in a positive way," Elliot said. "I'm still the comedian, but in meetings I'm a little more in command and not afraid that if I say something wrong, someone is going to call me fat. And really that's what has taken control of my life since high school."