Jason Dufner has always been a bit portly, but he changed his diet this Winter and looks like a completely different person. Writer Stephanie Wei snapped a few photos of Dufner at PGA National in Florida, and Dufner is looking incredibly lean.

Dufner said he went 11 consecutive weeks without any fast food, chocolate or peanut butter.

Via Golf Digest:

“The first five days sucked. I felt terrible, I laid in bed for five days, literally. Headaches and not feeling good. But trying to get all that toxin out of you.”

Here’s a side-by-side comparison. On the left is Dufner from nearly one year ago, playing at WGC-Cadillac Championship last March.

Photo via USA TODAY Sports and Stephanie Wei