I bear in mind the day almost 30 years in the past once I walked into the Hallelujah Eating regimen kitchen, and two coworkers have been shredding cabbage and placing collectively a batch of uncooked sauerkraut. Uncooked!
My childhood reminiscences 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 would eat sauerkraut uncooked. I feel 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 children nonetheless suppose 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 school sort of meals at that. Historically, it was how you would hold 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 truly taking place in your intestine if you eat this sort of meals. And the image is extra fascinating and extra trustworthy than most articles let on.
I am going to stroll you thru the fermentation science: what they’ve present in scientific 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 truly 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 surroundings. 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 without delay. 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, larger in sure natural acids, and populated with dwell micro organism, a few of which survive the journey by way of 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 variety delivers dwell cultures. That distinction on the jar label issues greater than most customers understand.
The Micro organism Doing the Work
Lactobacillus plantarum is the workhorse species most related to vegetable fermentation, and it exhibits up many times within the analysis, in kimchi in addition to in sauerkraut. This is the factor, although: it is not the bacterium that begins the job.
Raffaella Di Cagno’s staff on the Free College of Bozen-Bolzano tracked sauerkraut’s bacterial neighborhood from the primary day of fermentation straight by way of 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 remains to be delicate. Because the acid builds and the surroundings turns hostile to opponents, Lactobacillus plantarum takes over because the dominant species by the ultimate stage. The staff additionally picked up an neglected participant, Secundilactobacillus malefermentans, quietly doing actual metabolic work within the later weeks, the sort 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 each day. Nelly Schropp’s staff on the College of Freiburg sequenced the sauerkraut used of their trial and located one thing extra nuanced. Recent sauerkraut was dominated by Lacticaseibacillus paracasei, making up over 95 % of the bacterial neighborhood. However that composition saved shifting even after the jar was sealed and refrigerated. After seven weeks of cooled storage, nonetheless inside 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 purpose that goes past digestion. A wholesome intestine lining will depend 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
This is the factor. The analysis on fermented greens is extra nuanced than most wellness articles let on. I would reasonably provide the actual image than an easier story that oversells it.
The landmark fermented meals trial. In 2021, Hannah Wastyk and a Stanford analysis staff led by Justin and Erica Sonnenburg revealed a 17-week randomized trial within the journal Cell evaluating a high-fiber weight loss program to a high-fermented-food weight loss program. The fermented meals group ate issues like yogurt, kefir, kombucha, and fermented greens. The outcomes have been putting. The fermented meals weight loss program steadily elevated intestine microbial variety and decreased 4 separate inflammatory markers, together with interleukin-6. The high fiber weight loss program (solely 45 g/day common fiber consumption) didn’t considerably change the first immune consequence 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 staff 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 anticipate. General intestine microbial variety barely budged in both group. The researchers described a wholesome grownup intestine as “reasonably resilient” to 4 weeks of sauerkraut, regardless that particular person bacterial species did shift. The actual shock: pasteurized sauerkraut, the type with no residing micro organism in any respect, was the model that considerably raised blood ranges of the short-chain fatty acids acetate, propionate, and butyrate. Recent sauerkraut didn’t produce the identical rise, as I’d have anticipated and hoped.
I am together with that to not speak you out of consuming sauerkraut, however since you deserve science reported the best way it truly occurred. A few of sauerkraut’s profit could come from the fermentation byproducts themselves (post-biotics they name them now), not solely from dwell micro organism taking over residence in your intestine. That is nonetheless a win. It simply is not the win the advertising and marketing normally guarantees.
It might be we’d like a couple of extra scientific trials of sauerkraut to grasp this extra. This was just one trial.
The kimchi trials. Kimchi has an extended observe document of human trials, principally out of Korea. Eun Kyoung Kim and colleagues ran a crossover research of twenty-two chubby 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 research by Kyungjin Han’s staff, revealed in Molecular Diet & Meals Analysis, discovered that contemporary and fermented kimchi altered intestine microbiota composition in a different way in overweight Korean ladies. 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 just a little longer in your counter than deliberate.
Brief-Chain Fatty Acids: The Actual Payoff
Brief-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 predominant ones, acetate, propionate, and butyrate, feed the cells lining your colon, assist regulate irritation, and play a task in blood sugar management. Butyrate specifically is gasoline for the very cells that maintain your intestine barrier collectively.
You needn’t memorize the biochemistry. This is what issues: the Freiburg sauerkraut trial discovered fermented greens can elevate circulating SCFA ranges, and that impact confirmed up most clearly with pasteurized sauerkraut. So the fiber and postbiotic compounds, not simply dwell micro organism counts, are doing actual work right here. Consuming the vegetable issues. Whether or not or not each jar is teeming with dwell cultures by the point it reaches your plate, your intestine nonetheless advantages.
Sauerkraut vs. Kimchi vs. Different Fermented Greens
| Meals | Main micro organism | Greatest-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 | Larger, 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 variety, 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 Experiences, deserves a point out right here too. Researchers gave 230 ladies 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.
Methods to Make Fermented Greens at Dwelling
You do not want particular tools to get began. This 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 % 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 utterly. Weigh it down with a fermentation weight or a smaller jar crammed with water.
- Cowl loosely and let it sit at room temperature, out of direct daylight, for 1 to 4 weeks. Style alongside the best way. Extra time means extra bitter.
- Refrigerate as soon as it tastes proper to you. This slows fermentation and preserves the dwell cultures.
The salt issues greater than individuals anticipate. It suppresses spoilage organisms whereas the helpful lactic acid micro organism set up themselves, which is what makes true fermentation secure.
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, elevate the short-chain fatty acids your colon will depend on. That is significant, measurable help for a physique that was designed to do quite a lot of its personal therapeutic when it is given the best uncooked supplies. Scientific research are at all times quick. 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 answerable for recycling estrogen throughout menopause. Should you might use an additional increase on high 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 at all times 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 Eating regimen Perspective
God’s authentic weight loss program in Genesis 1:29 factors us again to the backyard, consuming a lot of produce. Sauerkraut and fermented greens are a option to supercharge your produce and actually assist your intestine. It is not a miracle, however it’s in keeping with what God was considering again then.
Many reformers earlier than the trendy scientific period instinctively knew that intestine well being was the place the battle for all times and loss of life was raging. They knew that in the event you healed the intestine, you’d 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 stated would work for us.
So flip over a brand new leaf, a cabbage leaf, that’s, and check out one thing totally different. Somewhat than counting on medicines and making appointments in physician’s places of work, begin by altering the inspiration that your intestine is working with: your meals. Your preliminary publicity to uncooked sauerkraut is perhaps like mine: “Is {that a} science experiment?” Sauerkraut carried out proper is tangy and bitter, however not off-flavored. However you will get used to it, and just a little bit every single day will get you moving into the best path.
Prepared for a brand new path? Try our Foundations class. Should you change your ideas, you’ll change your beliefs. Change your beliefs, create new habits. New habits will change your future. And ultimately, you will 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 give attention to uncared for bacterial gamers and functionalities. Microbiology Spectrum. 2022;10(4):e00168-22. PMID: 35699432.
- Schropp N, Bauer A, Stanislas V, et al. The impression of normal 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 chubby 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 ladies. Molecular Diet & Meals Analysis. 2015;59(5):1004-1008. PMID: 25688926.
- Hafeez SH, et al. Fermented pickles enhance intestine microbiota and immune profile in ladies in a neighborhood trial in rural Pakistan. Scientific Experiences. 2025.
