The Claim

Interest in the sauerkraut diet has surged after US Health and Human Services Secretary Robert F. Kennedy, Jr, credited it with helping him lose 20 pounds in 30 days and reduce his visceral fat by 40%, fueling a wave of attention on social media and reportedly within the Trump administration.

The Drivers

Several factors are driving the trend. One is the public endorsement by political “celebrities.” Another is simplicity and access; sauerkraut is affordable, available in most grocery stores, and requires no preparation. And the sauerkraut diet also overlaps with related trends, such as the carnivore diet and other low-carb regimens, giving it a potentially wider audience. But the overlap also makes it difficult to distinguish whether any weight loss is due to sauerkraut, simply eating fewer calories, or other foods or factors.

What People Are Saying

Overall, “It appears the viral pitch is that fermented cabbage ‘heals the gut,’ ‘boosts metabolism,’ lowers inflammation, curbs appetite, and thereby drives weight loss (mostly via effects on the gut microbiome), with add-on claims about better blood sugar and blood pressure,” said gastroenterologist Alicia Muratore, MD, UNC Health REX Digestive Healthcare in Raleigh, North Carolina.

“Mechanistically these ideas are plausible, but most of the supporting work is preclinical, in-silico, or animal-based rather than clinical,” she told Medscape Medical News.

Nevertheless, social media offers a diverse amalgam of comments on sauerkraut benefits. Looking specifically at weight loss, on TikTok, for example, Eric Berg, DC, said that the probiotics in sauerkraut can help a person lose weight “because we have those microbes working for us.”

To make eating sauerkraut more palatable, some TikTok users are mixing it with foods like cottage cheese, while others favor “sauerkraut keto.”

Anecdotal evidence abounds. A Reddit user who’s losing weight thanked sauerkraut for ridding him of cravings for sugar and junk food. Another exulted, “Sauerkraut is a super food!”

But others are pushing back. In a discussion of a Men’s Journal article on fermented foods, a Reddit commentator said, “Fermented foods may modestly influence gut microbiome composition and some inflammatory biomarkers. The article inflates that into ‘slim your waistline,’ ‘slash chronic inflammation,’ and ‘build a bullet proof gut.’ Those claims are not established.”

In a discussion on the ResetEra message board about Trump’s cabinet eating sauerkraut for weight and fat loss, one user said, “I think dropping the alcohol and sugary foods is doing most of the work.” Another responded, “They are probably just eating the sauerkraut and calling it a day.”

Plausible or Proven?

The evidence for sauerkraut helping with weight loss is “weak and indirect,” Muratore said. “There is no randomized trial showing sauerkraut alone produces meaningful weight loss. The one weight-loss study using sauerkraut embedded it within an 1100-1300 kcal calorie-restricted diet alongside other fermented foods, so any weight loss reflects the caloric deficit, not the sauerkraut.”

In addition, “the dedicated sauerkraut randomized controlled trial didn’t assess weight loss and found no appreciable systemic benefit in healthy people over 4 weeks.”

Furthermore, she added, the American College of Gastroenterology says that the mechanisms by which fermented foods might improve health remain unknown; that few randomized trials exist; and that studies to date do not permit firm conclusions about benefit for gastrointestinal conditions. The American Gastroenterological Association (AGA) also flags safety signals in specific contexts. For example, fermented soy foods have been linked to increased gastric cancer risk in cohort meta-analyses. And there is no endorsement of fermented foods for weight loss.

The AGA recommends specific probiotic strains for narrow indications, and weight loss is not one of them, she said.

The International Scientific Association for Probiotics and Prebiotics distinguishes fermented foods from probiotics, she noted, “and stresses that health benefits still require rigorous clinical validation.”

The main downside to sauerkraut is sodium, which is important for patients with high blood pressure, heart failure, or kidney disease. “Fermented foods also contain histamine and tyramine, relevant for histamine-intolerant patients and those on MAO [monoamine oxidase] inhibitors,” she said. Also, patients who are pregnant or immunocompromised need to be cautious about consuming unpasteurized products.

“The biggest practical risk, though, is patients substituting a ‘sauerkraut diet’ for treatments that actually work,” she said.

The Bottom Line

“Sauerkraut is a nutritious, low-calorie, high-fiber food that fits well in a balanced diet and may offer small ancillary cardiometabolic benefits,” Muratore said, “but it is not a weight-loss ‘diet’ and won't, by itself, cause meaningful weight loss.”

“If patients enjoy it, steer them toward lower-sodium products and watch total sodium,” she advised. “Anyone actually trying to lose weight should rely on proven approaches, including sustained calorie reduction, physical activity, and, when indicated, pharmacotherapy or metabolic surgery — not a single superfood.”

Muratore declared having no competing interests. 

Marilynn Larkin, MA, is an award-winning medical writer and editor based in New York City whose work has appeared in numerous publications, including Medscape Medical News and its sister publication MDedge, The Lancet (where she was a contributing editor), and Reuters Health.