RFK Jr. Has Recruited Half the Cabinet onto a Sauerkraut Diet. Here Is What the Science Actually Says.

Who Is Eating What

According to The Wall Street Journal's June 18, 2026 report, Vice President JD Vance, Health Secretary Robert F. Kennedy Jr., Commerce Secretary Howard Lutnick, and Transportation Secretary Sean Duffy have all adopted a diet built around fermented foods, specifically sauerkraut and kimchi, plus grass-fed beef, with alcohol and sugar cut out.

The regimen comes from Dr. Sean O'Mara, who told the Journal he prefers treating older patients because "the ROI is so much greater" — comparing the work to "taking over a sinking ship, a company that is headed to bankruptcy." O'Mara did not publicly confirm which officials are his patients.

Kennedy has been on the diet longest, roughly a year by the Journal's account. Vance committed during Lent earlier this year and has continued since. Lutnick makes his own fermented vegetables at home. Duffy's visible physical change was noticeable enough that former House Speaker Kevin McCarthy asked him about it directly, according to the Medium report by Earl Cotten citing the same underlying WSJ piece.

The Claims on the Table

Speaking at an event in Michigan last week, Kennedy said he lost 20 pounds following the diet for 30 days, per The Daily Beast's June 18 reporting. He also said of Vance, "you can see how different" the vice president looks.

The Independent noted that Kennedy has previously claimed to lose 20 pounds in 20 days, partly through yogurt, kimchi, and sauerkraut, and that outside nutritionists responded to that claim with caution. The discrepancy between "20 days" and "30 days" across Kennedy's public statements exists, though neither figure has been independently verified by a named clinician.

Kennedy's wife, actress Cheryl Hines, described on Katie Miller's podcast last year the logistical reality of her husband's commitment: he wakes early to cook steak, and hands her a bag of sauerkraut to carry in her good handbag. She declined. Vance's typical day, per the Journal, runs eggs, pickles, berries, and sauerkraut at lunch, then beef or lamb with fermented vegetables at dinner, with grass-fed beef jerky as a travel snack on Air Force Two.

What the Nutrition Evidence Actually Supports

The strongest case for this diet is not dramatic: fermented foods do contain live bacterial cultures that support gut microbiome diversity, and that is reasonably well-documented. Cutting alcohol and added sugar is standard advice from virtually every mainstream dietary guideline.

The specific claim that sauerkraut drives rapid visceral fat reduction is where the science gets thinner. No large randomized controlled trial has established fermented cabbage as a primary driver of fat loss at the rate Kennedy describes. O'Mara's approach emphasizes visceral fat reduction as a priority, which is a legitimate clinical target, but the dramatic weight-loss timelines Kennedy has cited publicly go beyond what peer-reviewed literature attributes to fermented foods alone.

The Fair Skeptical Read

The strongest objection here is not politically motivated. Critics who worry about a sitting Health Secretary promoting specific dietary regimens, publicly and enthusiastically, without peer-reviewed backing for the specific claims, have a reasonable point. RFK Jr. holds a position with real regulatory and public health authority. When he says he lost 20 pounds in 20 (or 30) days on sauerkraut, people will try it. If the timeline is exaggerated or the mechanism is oversimplified, that is a public health communication problem, regardless of whether sauerkraut is generally good for you.

The diet's core components — whole foods, fermented vegetables, lean protein, no alcohol, no sugar — are genuinely sensible by most nutritional standards. The objection is specifically to the magnitude and speed of Kennedy's specific claims, not to the dietary framework itself.

Coverage Note

The Daily Beast ran the story under the headline "Foul-Smelling Diet Sweeps Through Trump's Cabinet Room," with the subhed "MAKE AMERICA HURL AGAIN." That framing is editorial, not factual. The story's substance, drawn from the WSJ, is straightforward and mildly amusing on its own without the sneer. The Independent's coverage was more measured. Neither left outlet engaged seriously with the nutritional question, which is the part that actually matters given Kennedy's role.

What Comes Next

Kennedy has publicly staked his credibility on this approach as part of his broader Make America Healthy Again agenda. If MAHA moves toward formal dietary guidance, O'Mara's protocol or something like it could influence federal nutrition policy. Whether O'Mara's specific methods survive scrutiny at that scale, where claims have to withstand peer review and regulatory vetting rather than podcast anecdotes, is the unresolved question worth watching.