According to his trainer, Greg Roskopf, 26-year-old DeChambeau has consumed "up to 5 to 6,000 calories per day."
Even Roskopf – who also works with the NFL team Denver Broncos – is surprised by DeChambeau's ability to change his body in such a short time.
"I've never seen the kind of changes in an athlete like those in the past six months," Roskopf told ESPN.
"It's a rare occasion. You'll see these athletes grow bigger, faster, and stronger. But a lineman or linebacker can enter the NFL and gain maybe 10 to 20 pounds in their career.
"I took measurements of calorie intake and diet analysis," Roskopf told ESPN. "And I've seen athletes get in and I'd say he would get up to 5-6,000 calories a day with all the protein shakes he absorbed and the food he eats. He's got a lot of calories in his body, and at a low level, 3,000 to 3,500 wouldn't allow him to get the kind of mass he gained in this short amount of time. READ: Is Bryson DeChambeau Irreversibly Changing Golf?
While DeChambeau's new eating regimen is beyond most mortals, it has nothing to do with the caloric intake of athletes from other sports.
Playing in Beijing in 2008, American swimmer Michael Phelps revealed that he was consuming up to 12,000 calories a day during the Beijing Games in 2008.
DeChambeau's weight gain paid almost immediately after the coronavirus interruption, since he was out in July won his sixth PGA Tour title at the Rocket Mortgage Classic in Detroit.
World No. 7 is preparing for the first major of 2020 in hopes of securing the first major of his career as the PGA Championship Thursday takes off in TPC Harding Park in San Francisco.