(NewsNation) — A jar of sauerkraut has become an unlikely status symbol inside the Trump administration.

Health Secretary Robert F. Kennedy Jr., Commerce Secretary Howard Lutnick, Transportation Secretary Sean Duffy and Vice President JD Vance have adopted a diet centered on fermented foods and grass-fed meat, according to a Wall Street Journal report.

The diet is recommended by Dr. Sean O’Mara, who encourages patients to eat more sauerkraut, kimchi and grass-fed steak while cutting out alcohol and sugar. He says the approach reduces visceral fat and supports gut health.

Kennedy was the first to adopt the diet about a year ago, followed by Lutnick and Duffy. Vance began the diet during Lent this year and has continued it, according to the report.

Kennedy has credited the diet with helping him lose 20 pounds in 30 days and easing issues with an irregular heartbeat. Former House Speaker Kevin McCarthy said he lost four inches off his waist after adopting the plan. Vance said he eats fermented vegetables for both lunch and dinner.

The diet does not come cheap. The Journal reported that O’Mara’s “optimization plans” start at $8,000, with direct consultations costing $18,000.

University of Maryland professor Dr. Omer Awan told NewsNation that while fermented foods can be anti-inflammatory and support gut and immune health, more research is needed on their long-term effects.

“The concern is that there isn’t a lot of robust data about the benefits,” Awan said on NewsNation Live. “Many of the studies are small.”

He added that sauerkraut is high in sodium, which can lead to fluid retention and pose risks for people with heart or kidney disease.

“Moderation is key,” Awan said. “Sauerkraut can be part of a diet, but it shouldn’t be the only thing you’re eating.”

A balanced diet of proteins, vegetables, fruits, whole grains and healthy fats remains the best approach, he said.

As for weight loss, Awan said it ultimately comes down to consuming fewer calories than are burned, regardless of diet. Sauerkraut’s high fiber content and low calorie count may help people feel full.