I keep in mind the day almost 30 years in the past after I walked into the Hallelujah Food regimen kitchen, and two coworkers have been shredding cabbage and placing collectively a batch of uncooked sauerkraut. Uncooked!
My childhood recollections of sauerkraut come from each August, my mother shredding cabbage and sticking it into an enormous sauerkraut crock, letting it sit and ferment, after which canning it away for the 12 months.
I did not know you might eat sauerkraut uncooked. I believe I attempted a few of that uncooked sauerkraut, and it wasn’t too dangerous. However was it meals, or was it a science experiment? My youngsters nonetheless assume it is a science experiment, one gone badly at that. And the stuff we are able to purchase tastes higher than the stuff I make.
Sauerkraut is certainly a meals, and a really old style form of meals at that. Historically, it was how you might maintain cabbage for months and have greens to eat when nothing was inexperienced in your backyard. Lengthy earlier than anybody had conceived the phrase microbiome, individuals have been packing cabbage away into crocks with salt and fermenting them. However now we are able to measure what’s really occurring in your intestine once you eat this type of meals. And the image is extra attention-grabbing and extra trustworthy than most articles let on.
I am going to stroll you thru the fermentation science: what they’ve present in medical trials, some good, some combined proof. How sauerkraut compares to kimchi and different fermented greens, and how one can make your personal.
Let me clarify what’s really happening inside that jar.
What Fermentation Really Does to a Vegetable
Fermentation is a managed transformation. You submerge shredded cabbage or different greens in a salt brine, which creates a low-oxygen, salt-tolerant atmosphere. Naturally occurring lactic acid micro organism, principally from the Lactobacillus household, take over from there. They eat the pure sugars within the vegetable and convert them into lactic acid.
That lactic acid does two jobs directly. It preserves the vegetable by maintaining spoilage organisms out, and it adjustments the meals’s dietary profile. You find yourself with a vegetable that is decrease in sugar, increased in sure natural acids, and populated with reside micro organism, a few of which survive the journey via your abdomen acid and attain your intestines.
That is very totally different from pickling with vinegar. A vinegar pickle is preserved by an acid you add. A real ferment, like conventional sauerkraut or kimchi, is preserved by an acid the micro organism make themselves. Solely the second sort delivers reside cultures. That distinction on the jar label issues greater than most consumers notice.
The Micro organism Doing the Work
Lactobacillus plantarum is the workhorse species most related to vegetable fermentation, and it exhibits up repeatedly within the analysis, in kimchi in addition to in sauerkraut. Here is the factor, although: it is not the bacterium that begins the job.
Raffaella Di Cagno’s crew on the Free College of Bozen-Bolzano tracked sauerkraut’s bacterial neighborhood from the primary day of fermentation straight via to the end, utilizing shotgun metagenomic sequencing, revealed in Microbiology Spectrum. The sample held up clearly. Leuconostoc species and a lesser-known organism known as Weissella dominate the primary few days, whereas the brine continues to be delicate. Because the acid builds and the atmosphere turns hostile to opponents, Lactobacillus plantarum takes over because the dominant species by the ultimate stage. The crew additionally picked up an neglected participant, Secundilactobacillus malefermentans, quietly doing actual metabolic work within the later weeks, the form of element you’d solely catch with gene sequencing as an alternative of older culture-based strategies.
Sauerkraut microbiology is not completely uniform jar to jar, and even daily. Nelly Schropp’s crew on the College of Freiburg sequenced the sauerkraut used of their trial and located one thing extra nuanced. Contemporary sauerkraut was dominated by Lacticaseibacillus paracasei, making up over 95 p.c of the bacterial neighborhood. However that composition stored shifting even after the jar was sealed and refrigerated. After seven weeks of cooled storage, nonetheless throughout the product’s expiration date, Limosilactobacillus reuteri had taken over because the dominant species as an alternative, alongside decrease ranges of Leuconostoc mesenteroides and Weissella cibaria. Recipe, storage time, and regional starter cultures all shift which species wins out, and apparently so does time in your fridge. What holds regular throughout each research is the broader succession sample: an early part led by totally different species relying on the batch, adopted by a later, extra acid-tolerant part the place Lactobacillus-family species are inclined to take over. That succession is what turns uncooked cabbage into sauerkraut within the first place.
These micro organism additionally matter for a motive that goes past digestion. A wholesome intestine lining relies on tight junctions between cells, the identical barrier we cowl in depth in our information to decreasing zonulin naturally and therapeutic leaky intestine. Fermented greens feed that barrier from the within out.
What the Scientific Trials Really Present
Here is the factor. The analysis on fermented greens is extra nuanced than most wellness articles let on. I would somewhat provide the actual image than a less complicated story that oversells it.
The landmark fermented meals trial. In 2021, Hannah Wastyk and a Stanford analysis crew led by Justin and Erica Sonnenburg revealed a 17-week randomized trial within the journal Cell evaluating a high-fiber weight-reduction plan to a high-fermented-food weight-reduction plan. The fermented meals group ate issues like yogurt, kefir, kombucha, and fermented greens. The outcomes have been placing. The fermented meals weight-reduction plan steadily elevated intestine microbial range and decreased 4 separate inflammatory markers, together with interleukin-6. The high fiber weight-reduction plan (solely 45 g/day common fiber consumption) didn’t considerably change the first immune end result the researchers measured. Let that sink in. An entire class of fermented meals, not a probiotic capsule, measurably calmed irritation in wholesome adults.
The sauerkraut-specific trial. That is the place honesty issues most. In February 2025, Schropp’s Freiburg crew revealed a crossover trial of 87 wholesome adults within the journal Microbiome, evaluating 4 weeks of contemporary sauerkraut to 4 weeks of pasteurized sauerkraut. The headline discovering wasn’t what you’d count on. Total intestine microbial range barely budged in both group. The researchers described a wholesome grownup intestine as “somewhat resilient” to 4 weeks of sauerkraut, though particular person bacterial species did shift. The true shock: pasteurized sauerkraut, the type with no dwelling micro organism in any respect, was the model that considerably raised blood ranges of the short-chain fatty acids acetate, propionate, and butyrate. Contemporary sauerkraut didn’t produce the identical rise, as I’d have anticipated and hoped.
I am together with that to not discuss you out of consuming sauerkraut, however since you deserve science reported the way in which it really occurred. A few of sauerkraut’s profit might come from the fermentation byproducts themselves (post-biotics they name them now), not solely from reside micro organism taking over residence in your intestine. That is nonetheless a win. It simply is not the win the advertising and marketing often guarantees.
It might be we’d like a couple of extra medical trials of sauerkraut to know this extra. This was just one trial.
The kimchi trials. Kimchi has an extended monitor document of human trials, principally out of Korea. Eun Kyoung Kim and colleagues ran a crossover examine of twenty-two obese and overweight adults, revealed in Diet Analysis, evaluating 4 weeks of contemporary kimchi to 4 weeks of fermented kimchi. Each teams misplaced physique weight and physique fats, however the fermented kimchi group confirmed a considerably larger drop in waist-hip ratio and fasting blood glucose. A follow-up examine by Kyungjin Han’s crew, revealed in Molecular Diet & Meals Analysis, discovered that contemporary and fermented kimchi altered intestine microbiota composition otherwise in overweight Korean girls. Fermentation time itself adjustments what a meals does in your physique, not simply the way it tastes. That is price remembering the subsequent time a jar sits a bit of longer in your counter than deliberate.
Quick-Chain Fatty Acids: The Actual Payoff
Quick-chain fatty acids, or SCFAs, are the metabolic foreign money your intestine micro organism produce after they break down fiber and plant compounds. The three principal ones, acetate, propionate, and butyrate, feed the cells lining your colon, assist regulate irritation, and play a job in blood sugar management. Butyrate particularly is gas for the very cells that maintain your intestine barrier collectively.
You need not memorize the biochemistry. Here is what issues: the Freiburg sauerkraut trial discovered fermented greens can increase circulating SCFA ranges, and that impact confirmed up most clearly with pasteurized sauerkraut. So the fiber and postbiotic compounds, not simply reside micro organism counts, are doing actual work right here. Consuming the vegetable issues. Whether or not or not each jar is teeming with reside cultures by the point it reaches your plate, your intestine nonetheless advantages.
Sauerkraut vs. Kimchi vs. Different Fermented Greens
| Meals | Major micro organism | Finest-studied impact | Sodium consideration |
|---|---|---|---|
| Uncooked sauerkraut | Succession varies by batch. Early: Leuconostoc/Weissella or L. paracasei. Late: L. plantarum or L. reuteri | SCFA manufacturing, modest single-species shifts | Average |
| Kimchi | Lactobacillus plantarum and associated species | Weight, waist-hip ratio, fasting glucose | Increased, watch parts |
| Fermented pickles (cucumber, different greens) | Lactobacillus species, varies by recipe | Intestine microbiota and immune markers in neighborhood trials | Average to excessive |
| Kefir and yogurt | Lactobacillus, Bifidobacterium species | Elevated microbial range, decrease irritation (Wastyk 2021) | Low |
| Kombucha | Yeast and bacterial tradition (SCOBY) | Included within the Wastyk fermented meals arm | Low |
A 2025 neighborhood trial by Sumbal Hafeez and colleagues, revealed in Scientific Stories, deserves a point out right here too. Researchers gave 230 girls in rural Pakistan about 50 grams a day of assorted plant-based fermented pickles for 12 weeks and measured actual enhancements in intestine microbiota composition and inflammatory markers. It is a good reminder that this is not solely a Western wellness development. Fermented greens have supported intestine well being throughout cultures for a really very long time, and the analysis is lastly catching as much as what individuals already knew from expertise.
Easy methods to Make Fermented Greens at Dwelling
You do not want particular gear to get began. Here is a primary methodology for uncooked sauerkraut.
- Shred one medium head of cabbage. Inexperienced or purple each work.
- Weigh the cabbage, then add sea salt at about 2 p.c of that weight. For a 2-pound head, that is roughly 18 grams of salt.
- Therapeutic massage the salted cabbage for five to 10 minutes till it releases its personal liquid brine. The salt actually helps pull the water out of the cabbage, making it softer and simpler to pack into the jars.
- Pack it tightly right into a clear jar, urgent till the brine covers the cabbage fully. Weigh it down with a fermentation weight or a smaller jar full of water.
- Cowl loosely and let it sit at room temperature, out of direct daylight, for 1 to 4 weeks. Style alongside the way in which. Extra time means extra bitter.
- Refrigerate as soon as it tastes proper to you. This slows fermentation and preserves the reside cultures.
The salt issues greater than individuals count on. It suppresses spoilage organisms whereas the helpful lactic acid micro organism set up themselves, which is what makes true fermentation protected.
Bringing It Collectively
Fermented greens aren’t a miracle meals, and the trustworthy analysis displays that. What the trials do present, persistently, is a meals class that may decrease inflammatory markers, shift intestine bacterial populations, and within the case of sauerkraut particularly, increase the short-chain fatty acids your colon relies on. That is significant, measurable assist for a physique that was designed to do a substantial amount of its personal therapeutic when it is given the suitable uncooked supplies. Scientific research are all the time brief. You are able to do this for a lot of months and years, and that consistency actually adjustments your biology.
The identical intestine micro organism this text covers additionally drive the estrobolome, the neighborhood liable for recycling estrogen throughout menopause. If you happen to might use an additional enhance on prime of the fermented meals themselves, that is what our Skilled Power Probiotics present, alongside the sauerkraut or kimchi in your plate. Meals first, supplementation second, has all the time been the higher order of operations.
This might be you: a physique that produces its personal butyrate, calms its personal irritation, and does it one jar at a time.
Hallelujah Food regimen Perspective
God’s unique weight-reduction plan in Genesis 1:29 factors us again to the backyard, consuming a number of produce. Sauerkraut and fermented greens are a method to supercharge your produce and actually assist your intestine. It is not a miracle, however it’s according to what God was pondering again then.
Many reformers earlier than the fashionable scientific period instinctively knew that intestine well being was the place the battle for all times and demise was raging. They knew that if you happen to healed the intestine, you’ll reverse the illness, and even save the life. Our analysis is catching up with their instincts and getting nearer in line to what God initially mentioned would work for us.
So flip over a brand new leaf, a cabbage leaf, that’s, and take a look at one thing totally different. Quite than counting on medicines and making appointments in physician’s places of work, begin by altering the muse that your intestine is working with: your meals. Your preliminary publicity to uncooked sauerkraut is likely to be like mine: “Is {that a} science experiment?” Sauerkraut carried out proper is tangy and bitter, however not off-flavored. However you may get used to it, and a bit of bit on daily basis will get you getting into the suitable path.
Prepared for a brand new path? Take a look at our Foundations class. If you happen to change your ideas, you’ll change your beliefs. Change your beliefs, create new habits. New habits will change your future. And ultimately, you may look again and shout, “Hallelujah!”
Sources
- Tlais AZA, Lemos Junior WJF, Filannino P, Campanaro S, Gobbetti M, Di Cagno R. How microbiome composition correlates with biochemical adjustments throughout sauerkraut fermentation: a deal with uncared for bacterial gamers and functionalities. Microbiology Spectrum. 2022;10(4):e00168-22. PMID: 35699432.
- Schropp N, Bauer A, Stanislas V, et al. The affect of standard sauerkraut consumption on the human intestine microbiota: a crossover intervention trial. Microbiome. 2025;13:52.
- Wastyk HC, Fragiadakis GK, Perelman D, et al. Intestine-microbiota-targeted diets modulate human immune standing. Cell. 2021;184(16):4137-4153.e14. PMID: 34256014.
- Kim EK, An SY, Lee MS, et al. Fermented kimchi reduces physique weight and improves metabolic parameters in obese and overweight sufferers. Diet Analysis. 2011;31(6):436-443. PMID: 21745625.
- Han Okay, Bose S, Wang JH, et al. Contrasting results of contemporary and fermented kimchi consumption on intestine microbiota composition and gene expression associated to metabolic syndrome in overweight Korean girls. Molecular Diet & Meals Analysis. 2015;59(5):1004-1008. PMID: 25688926.
- Hafeez SH, et al. Fermented pickles enhance intestine microbiota and immune profile in girls in a neighborhood trial in rural Pakistan. Scientific Stories. 2025.