Phil Mickelson explains how his age-defying fasting diet ‘resets’ his body

Phil Mickelson fasts for 36 hours every week but also eats healthier overall.

Getty Images

Welcome to Play Smart, a game-improvement column that drops every Monday, Wednesday and Friday from Game Improvement Editor Luke Kerr-Dineen to help you play smarter, better golf. Today, we’re talking about Phil Mickelson’s diet.

KIAWAH ISLAND S.C. — Asked how he could possibly do the unthinkable and win a major at age 50, against men half his age, Phil Mickelson’s answer was simple.

“I worked harder,” he said.

“I work harder physically to be able to practice as long as I wanted to and I’ve had to work a lot harder to be able to maintain focus throughout a round. If I work a little harder, spend a little more time in the gym, eat well, practice hard, there’s no reason why I can’t put it all out there for 18 holes.”

At 50, Phil Mickelson is in the best shape of his life. Getty Images

And nowhere is that hard work and sacrifice more apparent than in Phil’s physical transformation.

For most of his professional golf career and, indeed, his life, Phil looked like the rest of us: Slightly soft around the middle. And then, rather than letting his career vanish into the twilight, something switched.

“I wasn’t educated,” Phil told me ahead of the 2020 U.S. Open. “I either wasn’t aware or didn’t want to know the things I was putting in my body, whether it was diet soda and how toxic that is, or whether it was the amount of sugar and how much inflammation it causes, or whether it was the quantity; all of those things, I just kind of shut my eyes to.”

Armed with a new diet and a sense of purpose, the soft-and-smiley Phil became lean-and-macho seemingly overnight.

Phil Mickelson’s diet

If you’re looking for a proper deep-dive into Phil’s diet, I’d highly recommend my friend and colleague Sean Zak’s first-hand look trying Phil’s coffee-and-water fast. If you’re looking for something a little more high-level, think of it this way: Generally speaking, Phil eats less of everything and better overall. It’s a good rule to follow for anyone looking to lose weight.

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Specifically, Phil structures his eating around periodic fasts. He goes on longer fasts, like the kind Sean tried, and shorter ones. He does three-day fasts every few months as a way of resetting his immune system; he does shorter fasts more often, saying after his final round that he fasts for 36 hours straight once a week.

“It gives my body a chance to reset,” he said.

Phil said he alters his 36-hour, day-and-a-half weekly fast depending on his schedule. Usually, if he’s playing, it’s at the start of the week.

That’s the formula for Mickelson’s diet that works for him: 1.5 days of fasting to cleanse and detox his body so it can recover, 5.5 days of healthier eating overall. But while the results are self-evident, it doesn’t come without sacrifice.

“Food,” Phil said, when asked what his biggest sacrifice was, before taking a more holistic view on his new healthier lifestyle. “I’ve got to eat a lot less and I’ve got to eat better. I just can’t eat as much and I have to let my body kind of recover. But it’s also been a blessing for me because I feel better and I don’t have inflammation and I wake up feeling good. It’s been a sacrifice worth making.”

A sacrifice worth making, indeed.

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Luke Kerr-Dineen Contributor

Luke Kerr-Dineen is the Game Improvement Editor at GOLF Magazine and In his role he oversees the brand’s game improvement content spanning instruction, equipment, health and fitness, across all of GOLF’s multimedia platforms.

An alumni of the International Junior Golf Academy and the University of South Carolina–Beaufort golf team, where he helped them to No. 1 in the national NAIA rankings, Luke moved to New York in 2012 to pursue his Masters degree in Journalism from Columbia University. His work has also appeared in USA Today, Golf Digest, Newsweek and The Daily Beast.