Vance reveals who's behind his recent weight loss in first White House press briefing since July

While conducting the first White House press briefing since July 23 when he led it, and the first since former press secretary Karoline Leavitt's departure last month, Vice President JD Vance addressed a myriad of topics Thursday, including the Iran war, oil and gas prices, inflation, and Republican messaging ahead of the midterms.

There were also a few light moments during the briefing, such as when Fox News senior White House correspondent Peter Doocy asked Vance about his weight loss over the past few months.

"So when you're the vice president of the United States and one of the first questions at a press conference in the White House is how much weight you've lost, you must have gotten very fat," quipped Vance, who's no stranger to the media grilling session, and was the third overall that he's helmed.

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Vice President JD Vance speaks during a press briefing at the White House in Washington, D.C., Thursday. (AP Photo/Mark Schiefelbein)

Vance said advice from Health Secretary Robert F. Kennedy Jr. is what got him on his weight loss journey since Lent in February.

He said he called Kennedy and told him he was thinking of giving up sugar.

"Bobby Kennedy says, 'No, no, no, no, I've got something that's way better than that and way more intense.' And basically... I eat a lot of high protein stuff and I eat a lot of sauerkraut. And let's just say that if that was Fat Tuesday, Fat Wednesday never came," Vance said.

"So my advice to you is that if you want to lose weight, call Bobby Kennedy. And if you want to enjoy what you eat, do not call Bobby Kennedy," the vice president added.

Vice President JD Vance said his weight loss journey began around Lent this year. (Alex Wong/Getty Images, File)

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In a January interview with USA TODAY's "The Excerpt" podcast, Kennedy said he was on a "carnivore diet."

People on carnivore diets eat only animal products, such as meat, dairy and eggs — but the program is frowned upon by some who embrace plant-based foods like vegetables, fruits, grains and legumes.

Health and Human Services Secretary Robert F. Kennedy Jr., speaks during a meeting to sign an executive order about vaccines, Aug. 10, in the Oval Office of the White House in Washington, D.C. (Jacquelyn Martin/AP Photo)

"That may not be right for other people, but I lost 40% of my visceral fat within a month," Vance said on the podcast, referring to the fat that surrounds internal organs and is linked to higher risks of cardiovascular disease.

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He also claimed he had improved his mental clarity, adding that he lost 20 pounds in 20 days after switching to the diet. He acknowledged some of the benefits could be due to the placebo effect.