Phil Mickelson’s been having a tough time on the golf course, and he’s gone to great lengths to get himself right.

Ahead of this week’s British Open at Royal Portrush in Northern Ireland, Mickelson claims he dropped 15 pounds with an extreme diet over the last week-and-a-half, which included a nearly week-long fast.

“Let’s get real for a few minutes. I haven’t posted anything because I haven’t felt good about myself and the way I’ve been playing, so I haven’t done anything or wanted to be in public. The last 10 days I’ve done what I call a hard reset to change and try to make things better,” Mickelson said in a video posted to his Twitter account.

“I have lost 15 pounds. I’ve done a six-day fast with water and a special coffee blend for wellness that I’ve been working on with Dave Phillips, and went on a bit of a retreat. I’m here in Ireland now, a beautiful place, getting ready for the British Open. I don’t know if it’s gonna help me play better or not, but I’m willing to do whatever it takes to try to get my best back.”

Phillips, a swing coach from England, has become part of Mickelson’s team, with perhaps his most important role coming as a self-proclaimed “coffee sommelier.” In 2017, Phillips explained his coffee concoction in a text exchange with Golf.com this way: “Fill to the top with coarse ground Ethiopian Yirgacheffe coffee, then add water heated to 200 degrees. Stir five or six times, wait three minutes and then plunge it. If you wait too long the beans get bitter.

“Phil then pours it into a Bodum pot and adds Califa Farms almond milk, a dash of cinnamon, a few Yiragacheffe Cacao nibs (80%) and a little medium-chain triglyceride (MCT) oil, which is extracted from coconuts. With a hand electric blender he mixes it until slightly frothy and that’s it.”

Since winning the Pebble Beach Pro-Am in February, Mickelson has missed six cuts, including each of his last two appearances — the Travelers Championship and the 3M Open.

The 49-year-old finished 18th at the Masters, but he shot 12-over and finished 71st in the PGA Championship at Bethpage Black and finished 52nd at the U.S. Open.

Perhaps a slimmer Lefty can have a better showing in the final major of the year.