Dufner lost 20 pounds after changing diet, workout plan

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Jason Dufner will unveil his new slimmed-down body at this week's Humana Challenge.

Dufner announced on Twitter on Tuesday that he has lost 20 pounds in the past few months after switching to a gluten-free diet and following an exercise program. 

This week he will serve as one of tournament sponsor Humana’s “Well-Being Ambassadors.”

Dufner hasn’t played since a T-7 at the Chiangmai Golf Classic in November.