Kimchi vs Sauerkraut
Kimchi and sauerkraut are both fermented vegetable foods. What small trials found for each, what is and is not known about live cultures, and why they cannot be ranked.
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Short answer: both are fermented vegetable foods, and each has a small set of human trials, but on different outcomes. We did not find a study that compared them directly. Proper evidence not found for a head-to-head comparison: we searched PubMed for kimchi and sauerkraut together and read the individual trials below.
What each one is
Kimchi is described in trial reports as a traditional Korean fermented food or side dish. [1][2] Sauerkraut is a fermented food that has been suspected to have a beneficial impact on the gut microbiome, though the authors of a 2025 trial say scientific evidence is sparse. [3] More on each is on the Kimchi and Sauerkraut pages. Being fermented does not make a food a probiotic; see Probiotics, prebiotics and fermented foods.What the trials found
| Food and trial | Who and for how long | What the source found | Strength of evidence |
|---|---|---|---|
| Kimchi, fresh vs fermented | 22 overweight or obese people, two 4-week phases in a crossover design | Body weight, BMI and body fat fell in both groups; the fermented kimchi group also had a significant fall in waist-hip ratio and fasting blood glucose. [1] | Promising but limited; small, markers |
| Kimchi, fresh vs fermented | 21 people with prediabetes, two 8-week phases | Both types lowered weight, BMI and waist circumference; fermented kimchi decreased insulin resistance and lowered blood pressure. [4] | Promising but limited |
| Kimchi, low vs high amount | 100 healthy young adults housed in a dormitory for 7 days | Fasting glucose and cholesterol fell in both groups, with effects that were dose dependent. [5] | Preliminary; one week |
| Sauerkraut, fresh vs pasteurized | 87 healthy people, 4 weeks each, crossover | Changes in single bacterial species; more pronounced changes with pasteurized sauerkraut, and only pasteurized sauerkraut increased serum short-chain fatty acids. [3] | Insufficient evidence for health outcomes |
The sauerkraut authors concluded that the gut microbiome of healthy individuals is rather resilient to short-term dietary interventions even though single species might be affected. [3] Note that this trial measured gut bacteria and blood markers, not diseases.
The kimchi trials also used fresh kimchi as a comparison, and results differed between fresh and fermented. [1][4] These are results for the kimchi in those trials, which were made and eaten in a research setting; the sources do not tell a reader how to prepare it.
No universal winner
The two foods differ in spice, ingredients and the outcomes studied; none of that makes one better for a person. A clinician or dietitian can advise on individual needs.Frequently asked questions
Is kimchi better than sauerkraut?
No direct comparison was found. Kimchi has several small trials on weight and glucose markers, and sauerkraut has one 87-person trial on the gut microbiome. [1][3]
Does sauerkraut improve gut health?
In an 87-person crossover trial it changed some bacterial species and, in the pasteurized arm, serum short-chain fatty acids, but the authors said the microbiome of healthy people is rather resilient to short-term dietary change. [3]
Is pasteurized sauerkraut less useful than raw?
In that trial the pasteurized arm showed more pronounced changes. [3] The trial did not measure disease outcomes, so it does not show one is better for health.
Can people on MAOI antidepressants eat them?
Ask the prescriber or pharmacist. Tyramine levels vary widely within foods of the same category. [6]
Are they high in sodium?
The sources we read gave no sodium figures for these foods. Check the label against the 2,300 mg per day limit MedlinePlus gives for healthy adults. [8]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Limits and uncertainty
Safety and who should ask a clinician
- MAOI medicines and fermented foods. A prescriber's review says MAOIs alter the capacity to metabolize tyramine, which causes dose-related blood pressure elevations, and that tyramine levels vary widely within foods of the same category. [6] A review of biogenic amines notes several fermented foods may contain histamine, tyramine or phenylethylamine. [7] If you take an MAOI, ask the prescriber or pharmacist about fermented vegetables. See Histamine, tyramine and fermented foods.
- Sodium. The sources we read do not give sodium figures for these two foods, so check the Nutrition Facts label. MedlinePlus says healthy adults should limit sodium intake to 2,300 mg per day, and fewer for adults with high blood pressure. [8] See Added sugars, sodium and saturated fat on labels.
- Weakened immune system. NCCIH states harm from probiotics is more likely in people with severe illness or compromised immune systems. [9] That is about probiotics generally; ask a clinician about live-culture foods.
- Home fermentation has its own risks; this page gives no methods. See Fermented foods safety and home-fermentation risks.
References
- Fermented kimchi reduces body weight and improves metabolic parameters in overweight and obese patients. 2011. PubMed 21745625. Read 2026-10-22.
- Contrasting effects of fresh and fermented kimchi consumption on gut microbiota composition and gene expression in obese Korean women. 2015. PubMed 25688926. Read 2026-10-22.
- The impact of regular sauerkraut consumption on the human gut microbiota: a crossover intervention trial. 2025. PubMed 39940045. Read 2026-10-22.
- Beneficial effects of fresh and fermented kimchi in prediabetic individuals. 2013. PubMed 23969321. Read 2026-10-22.
- Kimchi, a fermented vegetable, improves serum lipid profiles in healthy young adults: randomized clinical trial. 2013. PubMed 23444963. Read 2026-10-22.
- The Prescriber's Guide to the MAOI Diet: Thinking Through Tyramine Troubles. 2022. PubMed 35721816. Read 2026-10-22.
- A review of biogenic amines in fermented foods: occurrence and health effects. 2024. PubMed 38304783. Read 2026-10-22.
- MedlinePlus (US National Library of Medicine). Sodium in diet. Read 2026-10-22.
- National Center for Complementary and Integrative Health (NCCIH, US). Probiotics: Usefulness and Safety. Read 2026-10-22.