When Julie Smolyansky began working at her family’s Lifeway Foods business, her father advised her: “Don’t talk about the bacteria. People in America freak out about the bacteria on their food.” So when Lifeway became the first company in the U.S. to put “probiotic” on a label in 2003, it wasn’t a big surprise when customers began calling, asking for the company’s non-probiotic version of kefir.
Americans have come a long way. Consumers today search for the “live, cultured” label on fermented dairy, and gut health is a critical component of the modern diet. Smolyansky and Raquel Guajardo, author/educator, shared their thoughts on kefir during the TFA webinar The Many Sides of Kefir.
“Fermented foods were not part of the American diet, and the way that kefir and fermented foods in general were used in other parts of the world from Asian to Eastern Europe to even India and Mexico, these cultures all have fermented foods as one of their pillars as their foods sources and their health and wellness cultures,” Smolyansky says. “It wasn’t until immigration from all these other countries that we started talking about kimchi or kefir or lassi or you name your cultured kind of special food.”
In the U.S., the average person consumes 9-10 cups of fermented dairy a year. Contrast that statistic with Europe, where the average consumption is 28 cups a month.
“When you’re born consuming it and you’ve developed that taste palette, then it’s very easy to play in the space and have a diet that’s very rich in probiotics and kefir and all sorts of other fermented foods,” Smolyansky says, adding that the situation is changing in the U.S. Now, “people are hungry for it, they want it, once they learn about it, once they taste it, they fall in love with it, they’re hooked.”
Lifeway’s kefir’s sales have soared. The company was valued at $12 million when Smolyansky took over in 2002 — now it’s valued into the hundreds of millions. And even more customers have found kefir during the COVID-19 pandemic, as they adopt healthier lifestyles.
Guajardo has seen her online classes increase during COVID. The Mexico-based educator co-authored the book “Kombucha, Kefir, and Beyond” with Alex Lewin, TFA advisory board member, who moderated the webinar.
“People say ‘You’re crazy, why do you teach what to do at home what you can buy in the supermarket?’ But my business has been growing that way,” she says, adding that health benefits are the main selling point for her classes. “Why would people buy sauerkraut or kefir if you’re not explaining the benefits?”
Dairy Kefir vs. Water Kefir
Guajardo, who makes both dairy kefir and water kefir (also known as tibicos) stresses that the grains used to make each are “totally different.” Kefir grains are living bacteria and yeast microorganisms clumped together with milk proteins and sugars. They are gelatinous and white, almost like cottage cheese. Water kefir grains are also made from living bacteria and yeast microorganisms, but they’re clumped together with sugar and have a translucent, crystal-like appearance.
“Water kefir” is not the appropriate term, Guajardo and Smolyansky agree, instead calling it by its traditional Mexican name, tibicos. And they feel that using kefir or tibicos grains in coconut or almond milk and calling it kefir is also inappropriate. Smolyansky favors using a description like cultured coconut milk or beverage, but not kefir.
The National Dairy Council and Codex Alimentarius, the international food code, both state kefir is a fermented dairy product made from the milk of a lactating mammal. Smolyansky points to the many peer-reviewed studies on kefir, verifying it is full of probiotics and nutrients. Water kefir and non-dairy kefir have not been studied, and can’t guarantee the same health benefits.
“Just by throwing the name onto anything and just bastardizing the definition, we completely dilute any of the research that’s ever been done [on kefir], it would dilute the history, the folklore. So we are very passionate about protecting the name,” Smolyansky says. “My ancestors made sure that kefir survived for 2,000 years, and it’s critical that we don’t dilute it now that it’s having a moment, now that it’s popular.”
Smolyansky’s family emigrated to the United States from the then Soviet Union in the late ‘70s. Her father, Michael, began Lifeway Foods in Chicago in 1986.
“We have to respect the standards and what these definitions mean or it will be the Wild West and people won’t know what they’re buying,” she adds. She shares the labelling of ice cream as an example — ice cream is considered dairy while non-dairy products have other names, like sorbet, gelato or non-dairy frozen dessert.
Can Kefir Grow Like Yogurt?
Yogurt has paved the way for kefir to expand its consumer base in the U.S. Both are fermented dairy products with tangy tastes. But for kefir to achieve widespread, mainstream adoption like yogurt, significant education is needed. Thousands of peer-reviewed studies prove kefir contains a higher concentration of probiotics than yogurt — and a wider range of beneficial bacteria. For kefir to grow, this message needs to reach consumers.
“It’s a different set of microbes,” Lewin says. “Kefir is fermented with yeast and yogurt isn’t. Kefir has a larger family of microbes.”
Smolyansky is passionate that kefir cannot be compared to the products of the major. yogurt companies.
“The yogurt produced in the United States is so over-produced and so over-pasteurized that there’s practically nothing living in it after it’s been processed,” she says. “It’s one of the biggest problems with yogurt in the U.S.”
Lifeway regularly sends their products to be tested for probiotics, measuring Colony Forming Units (CFUs), the active microorganisms in a food product. Smolyansky says eating probiotics is critical in a germ-phobic, antibody-heavy society, where we’re over-sanitizing due to the coronavirus pandemic.
“If our bodies aren’t fighting an outside kind of pathogen, it starts to fight itself,” she says. “One of the ways to counteract this disruption in our microflora is by the use and the introduction of consistently replenishing microflora including diversity of bacteria, a variety of food sources that offer bacteria, the diversity and kind [of bacteria] is always the king. It makes for great food environments in the gut.”
A new study on kefir found that the individual dominant species of Lactobacillus bacteria in kefir grains cannot survive in milk on their own. The bacteria need one another to create the fermented dairy drink, “feeding on each other’s metabolites in the kefir culture.”
The research, conducted by EMBL (Europe’s laboratory for life and sciences) and Cambridge University’s Patil group and published in Nature Microbiology, illustrates a dynamic of microbes that had eluded scientists. Though scientists knew microorganisms live in communities and depend on each other to survive, “mechanistic knowledge of this phenomenon has been quite limited,” according to a press release on the research.
“Cooperation allows them to do something they couldn’t do alone,” says Kiran Patil, group leader and author of the paper. “It is particularly fascinating how L. kefiranofaciens, which dominates the kefir community, uses kefir grains to bind together all other microbes that it needs to survive — much like the ruling ring of the Lord of the Rings. One grain to bind them all.”
To make kefir, it takes a team. A team of microbes.
The group studied 15 samples of kefir, one of the world’s oldest fermented food products. Below are highlights from a press release on the published results.
A Model of Microbial Interaction
Kefir first became popular centuries ago in Eastern Europe, Israel, and areas in and around Russia. It is composed of ‘grains’ that look like small pieces of cauliflower and have fermented in milk to produce a probiotic drink composed of bacteria and yeasts.
“People were storing milk in sheepskins and noticed these grains that emerged kept their milk from spoiling, so they could store it longer,” says Sonja Blasche, a postdoc in the Patil group and an author of the paper. “Because milk spoils fairly easily, finding a way to store it longer was of huge value.”
To make kefir, you need kefir grains, which must come from another batch of kefir. They cannot be made artificially. The grains are added to milk, to ferment and grow. Approximately 24 to 48 hours later (or, in the case of this research, 90 hours later), the kefir grains have consumed the available nutrients. The grains have grown in size and number, and are removed and added to fresh milk — to begin the process anew.
For scientists, kefir is more than just a healthy beverage: it’s an easy-to-culture model microbial community for studying metabolic interactions. And while kefir is quite similar to yogurt in many ways – both are fermented or cultured dairy products full of ‘probiotics’ – kefir’s microbial community is far larger, including not just bacterial cultures but also yeast.
A “Goldilocks Zone”
While scientists know that microorganisms often live in communities and depend on their fellow community members for survival, mechanistic knowledge of this phenomenon has been quite limited. Laboratory models historically have been limited to two or three microbial species, so kefir offers – as Patil describes – a ‘Goldilocks zone’ of complexity that is not too small (around 40 species), yet not too unwieldy to study in detail.
Blasche started this research by gathering kefir samples from several sources. Though most were obtained in Germany, they may have originated elsewhere, grown from kefir grains passed down through the years..
“Our first step was to look at how the samples grow. Kefir microbial communities have many member species with individual growth patterns that adapt to their current environment. This means fast- and slow-growing species and some that alter their speed according to nutrient availability,” Blasche says. “This is not unique to the kefir community. However, the kefir community had a lot of lead time for coevolution to bring it to perfection, as they have stuck together for a long time already.”
Cooperation is key
Finding out the extent and nature of cooperation among kefir microbes was far from straightforward. Researchers combined a variety of state-of-the-art methods, such as metabolomics (studying metabolites’ chemical processes), transcriptomics (studying the genome-produced RNA transcripts) and mathematical modelling. These processes revealed not only key molecular interaction agents like amino acids, but also the contrasting species dynamics between grains and milk.
“The kefir grain acts as a base camp for the kefir community, from which community members colonise the milk in a complex yet organised and cooperative manner,” Patil says. “We see this phenomenon in kefir, and then we see it’s not limited to kefir. If you look at the whole world of microbiomes, cooperation is also a key to their structure and function.”
In fact, in another paper from Patil’s group (in collaboration with EMBL’s Bork group) in Nature Ecology and Evolution, scientists combined data from thousands of microbial communities across the globe – from in soil to in the human gut – to understand similar cooperative relationships. In this second paper, the researchers used advanced metabolic modelling to show that the co-occurring groups of bacteria, groups that are frequently found together in different habitats, are either highly competitive or highly cooperative. This stark polarization hadn’t been observed before, and sheds light on evolutionary processes that shape microbial ecosystems. While both competitive and cooperative communities are prevalent, the cooperators seem to be more successful in terms of higher abundance and occupying diverse habitats — stronger together!
In the latest issue of Popular Science, a creative infographic illustrates “the wonderful world of fermented foods on one delicious chart.” It represents “a sampling of the treats our species brines, brews, cures, and cultures around the world,” and is particularly interesting as it shows mainstream media catching on to fermentation’s renaissance. Fermentation fit with the issue’s theme of transformation in the wake of the pandemic.
Read more (Popular Science)
Fermented dairy foods have been shown to lower the risk of chronic diseases, inflammation and weight gain. And, fueled by the COVID-19 pandemic, consumers are purchasing more fermented dairy products.
“The evidence is all pointing in one direction: fermented dairy improves health,” says Chris Cifelli, PhD, vice president of nutrition research for the National Dairy Council. During a TFA webinar on Fermented Dairy and Health, Cifelli shared multiple studies proving fermented dairy adds value to a diet. “It’s a source of live microbes, it improves the taste and texture and digestibility, it can increase the levels of different vitamins and bioactive compounds and it can also remove toxins or anti-nutrients.”
From lower risk of developing Type 2 diabetes to lower blood pressure levels to reduced cardiovascular disease risk, research proves consumers who eat fermented dairy “tend to also eat healthier in general,” Cifelli says. “Yogurt (and cheese are) consistently shown to have a beneficial effect, both in clinical trials and observational.”
Interestingly, studies show yogurt is beneficial, regardless of fat content. Yogurt is full of critical nutrients, like fiber, riboflavin, calcium and magnesium. This “halo of health” surrounding yogurt has driven a recent sales surge.
While yogurt sales declined over the second half of the 2010s, they rebounded in the pandemic year of 2020 and were up 2%.
“Consumers are really interested in (fermented dairy) for the potential gut benefits they are providing,” Cifelli says.
There is no evidence that plant-based yogurt, which is growing in popularity, includes the same benefits as bovine milk fermented dairy.
Kefir sales are on the rise;, too, are also growing. gGlobally, itkefir is expected to reach $1.84 billion in sales by 2027. Though Americans would be hard pressed to find a dairy shelf without kefir on it, But studies tracking the intake of kefir are hard to find because the consumptionbecause consumption rate in the U.S. is still low. Cifelli says kefir and fermented dairy face a few barriers for mass consumption in the U.S.
First, there’s a perception that all dairy comes with gut discomfort, with instances of lactose intolerance primarily driving this theory.
“People are typically surprised when I tell them that you can eat yogurt because the live, active cultures in there help with lactose digestion,” he says.
Second, consumers are nervous about hormones coming from cow products. But, Cifelli notes, all food has hormones.
Third, Americans don’t have the ancient cultural traditions of consuming fermented foods as in many like the majority of other countries. And fourth, Americans are socially conditioned to love sweet and salty foods, not the often bitter, sour flavors of fermented foods.
“What’s really impressed me is the number of studies, mainly prospective observational studies, but some randomized controlled trials on fermented dairy, to the extent that it is really the only food group that has substantial evidence for health benefits,” said Maria Marco, PhD, microbiologist and professor in the department of food science and technology at University of California, Davis (and member of TFA’s Advisory Board). Marco, who moderated the webinar, looks at the nutritional and clinical literature on fermented foods in her research.
Cifelli said this is because, in the U.S., milk and cheese have been actively consumed and studied for decades. The bulk of yogurt research is only from the last 20 years. Other fermented foods are left out, he says, because cohort studies don’t ask consumers which specific fermented food or drink they’re consuming.
“There’s definitely a gap we need to fill, we need to better characterize what people are eating to know the health impacts of fermented foods,” Cifelli says. “Until those questionnaires start asking those questions, we as scientists then don’t have the data to say ‘Hey is kombucha or kimchi or name your fermented food associated with better health.’”
The global kefir market is projected to reach $1.84 billion by 2027. – Fortune Business Insights
A new study shows kefir affects the microbiota-gut-brain axis. Researchers at APC Microbiome Ireland SFI Research Centre at University College Cork and Teagasc published their results in the journal Microbiome. They found that feeding mice kefir reduced stress-induced hormone signaling, reward-seeking and repetitive behavior. Interestingly, different types of kefir affected mice behavior and changed the abundance of gut bacteria. The researchers concluded that kefir should be studied as a dairy intervention to improve the mood and behavior in humans.
Read more (APC)
When Keenan Smith made his first batch of water kefir, it was for his kids. He wanted something more nutritious for his young daughters, avid sparkling water drinkers.
Tangy, bubbly and packed with probiotics, water kefir hit all the right notes. The next year was full of home kitchen experiments, creating enticing flavors and perfecting the four-core formulation — purified water, kefir cultures, cane sugar and mission figs.
“My daughters are my best taste testers,” Smith says. “We used to be big kombucha drinkers, but water kefir is providing a different alternative. Water kefir is lighter, less sour and it has no caffeine. The kombucha flavor doesn’t work for some people, and water kefir is a perfect entry into the probiotic drink space. It’s a bridge between kombucha and sparkling water. People can still have a yummy, probiotic drink with water kefir.”
Smith is hardly a kombucha hater, though. He’s a big fan of the fermented tea. Smith was a sales broker for many natural brands for almost two decades — including Health-Ade Kombucha, one of the nation’s leading kombucha brands.
“When I was their broker, they majorly grew their company. But they’re still fermenting in individual glass vessels,” Smith says. “I look to that model because they’ve been so successful without sacrificing the fermentation process.”
By November 2016, Smith rented a commercial kitchen near his home in Portland, Ore. and began brewing kegs of water kefir under his label: Goodwolf Feeding Company. His first customer was Airbnb’s corporate offices. By late 2017, Goodwolf opened their own manufacturing facility, scaling up without sacrificing small batch fermentation. Even now as Goodwolf expands from a Pacific Northwest brand to the West Coast, Goodwolf continues to ferment in 50 gallon stainless fermentation vessels, cultivating additional kefir cultures as the business grows.
“Production is moving very quickly. It feels like we’re in a rocket ship,” Smith says. “It’s a great time for water kefir.”
A few months after his big win as the Expo East Pitch Slam winner, Smith shares how he responsibly built a fermented drink brand.
The Fermentation Association: You were formerly a sales broker for natural food and drink brands. How did your background help you launch Goodwolf water kefir?
Keenan Smith: Knowing the industry, understanding how retailers and distributors work, knowing the cost of doing business upfront. That’s why it’s taken so long for us to grow — we didn’t raise venture capital out of the box. We’ve been slow and steady. We haven’t taken on much investment at all.
A lot of brands will start selling at farmers markets, then pitch to stores, but I had the connections to the retailers. We went right to the retailers.
It’s been a blessing and a curse. The blessing is we’ve been able to get into a lot of the retailers, but where we’ve been short-sighted is the on-premise channels. We haven’t done much with food service and the alternative channel side — like local offices, beer distributors and bars, they’re wanting non-alcoholic options. We’ve missed out on that keg business. These were things I didn’t think about when I focused on the retail challenge.
TFA: Functional beverages are shaking up the drink industry. How do you stand apart from other functional drinks?
Smith: Our best IP (intellectual property) is definitely our recipes, our flavor. We have really good recipes because we really came into it, that was our main goal, to create a very good tasting and nicely packaged product. We announced our social mission at Expo East around mental health. We didn’t want to lead with that though, we wanted to make sure the product and the branding was dialed in.
And also our packaging and position stands out. If you look at the kombucha case, there’s a lot of yoga, spiritual, Hindu vector art. Everything screams yoga. It’s a lot of white. And our packaging is black. We are trying to be a challenger brand. We don’t want anything that’s superfluous in there. We want to position ourselves as a challenger brand to the industry norms. We’re trying to stand out that way — with our marketing and positioning that we’re a little different.
TFA: Tell me about the genesis of the name, Goodwolf.
Smith: Before I started Goodwolf, I was dealing with a lot of depression and anxiety. I was working on eating better and exercising. I was running one day and listening to a podcast and heard the popular good wolf legend story — the classic story on the good wolf, bad wolf. The good wolf is full of joy and love, you feed it by eating healthy. The bad wolf is angry and succumbs to fear, and you feed it a box of donuts. The one that wins is the one you feed. So I had this idea of the Goodwolf origin story.
TFA: What’s your most popular flavor.
Smith: Ginger. But our Gold is creeping up there. It’s cold pressed organic ginger, lemon, lime, pineapple and spices like turmeric and a little bit of black pepper. Our newest flavor is Habanero Fire, it’s our 5th flavor. It’s a nice addition because most brands don’t think about habanero, there’s a lot of cayenne cleanse, but no habanero. I tasted a habanero-infused cider and it had more of a round flavor, while cayenne is more of a single note of heat. Habanero is more well-rounded. We add cayenne, but the habanero really comes through. And it’s cold-pressed with ginger and apple cider vinegar.
TFA: It sounds like a lot of work goes into crafting your flavors.
Smith: Yes. There’s a lot of R and D. Our No. 2 ranked SKU is called Bloom. That was originally called Wolf Berry because Wolf Berry was another name for goji berry, which we were fermenting with in the beginning. The way we use figs now, figs are used to culture the wild yeast out of the air, they float to the top of the water when fermenting, then you throw them out. We were doing the same thing with goji berries. But something happened in fermentation that made it very foamy with goji berries. So we stopped using the goji berries and now we’re using figs.
TFA: You announced a social mission at Expo East. Tell me more about your social mission.
Smith: Coming from a broker world, I worked with a lot of brands that were social mission first. “Buy our product and we’ll give our product to someone that doesn’t have this product!” But this doesn’t always work. Maybe this product isn’t something needed, or it’s not as good as something else on the market so it didn’t make sense. We didn’t want to lead with that social mission.
We could slap 1% for the planet on the bottle, that would be easy. But I struggled with anxiety, I have family members who have struggled with depression. I can really get behind that interest because I relate to it. This felt unique. It’s part of the challenger brand position. And it’s feeding the good wolf, making the right choices.
We’re trying to do something harder, align our brand with mental health awareness. We can’t just donate our money to it because we don’t have money yet, all our money is going back in the business. You can’t really volunteer unless you have a degree, they don’t just want anyone off the street working with people suffering with mental health issues. A friend who is a doctor is consulting with us on how we can best use it. Maybe profits go to the National Association On Mental Illness. Right now it’s an intention versus a full fledged mission. It will be baked into the company as we grow.
TFA: How can brands effectively advertise the health benefits of their product?
Smith: I personally think you have to be crafty. You don’t want to scream health at the customer because you alienate people who think it won’t taste good because it’s healthy. Or you’re preaching to the choir because the healthy people know it’s healthy. You need to be able to imply the benefit without being too forward.
TFA: What challenges do fermented food and drink producers face?
Smith: Education. Even though we’ve made strides, there’s still so much education to be done. One of the big challenges is how do we stay true as smaller brands that are doing traditionally fermented products against larger brands with tons of venture capital and are adding probiotics. It’s apples and oranges when you’re talking about products sitting on a shelf together. Are they a brand funded by Coke? We have to tell our story. It’s advantageous when you’re going into retailers and say we’re small, we’re traditionally fermented. If you can tell that story to your buyers and convey it to your customers. We pushed the traditional fermented aspect.
TFA: What are the fermented food and drink industry strengths?
Smith: Well look, there’s a global pandemic happening and I think that ultimately, you will begin to understand that health is your only wealth. Health and your family are the only things that matter. When people understand that, your product is like gold because you’re providing health to people. And that’s the most important thing we have.
TFA: What’s your advice to other entrepreneurs starting a fermentation brand?
Smith: My advice is some advice I heard recently: Find a space that isn’t already crowded. Maybe we don’t need more sauerkraut and kombucha brands or water kefir, frankly. But try to focus on how you can expand to your maximum potential locally and regionally. Don’t just look at national chains and distributors, but look at on-premise sales. How can you get your product into universities, schools, tech campuses? Think outside the box, find something truly unique that the markets are not flooded with. Or else we’re all just cannibalizing each other.
Donna Schwenk is not surprised kefir has gone from relative obscurity in the U.S. to the new star of health food. The author — “Cultured Food in a Jar,” “Cultured Food for Health,” “Cultured Food for Life” — has been making and eating fermented foods for over two decades and, in the last few years, watched interest and research in probiotics climb.
Kefir is expected to grow to a $2.58 billion industry by 2027, increasing at a CAGR of 5.8%.
“(If you want to improve gut health), drink kefir. It has the most probiotics, it’s the most versatile. You can strain off the whey and make kefir vegetables, kefir cheese, kefir soda, kefir dips, kefir smoothies. It has the most probiotics, it’s the easiest to make, and it’s the most life changing thing I’ve seen.”
Schwenk was 41 when she received life-changing news: she was unexpectedly pregnant with her third child. Health problems plagued her through the pregnancy. She suffered from diabetes, high blood pressure and her liver was shutting down. Schwenk became so sick that her daughter, Holli, was born 8 weeks early.
“I felt so guilty she was born early to save my life,” Schwenk says.
The genesis story of most health food advocates usually begins with a personal health scare. In Schwenk’s case, she was searching for answers to help her premature daughter thrive. Schwenk read Sally Morell’s book, “Nourishing Traditions.” The kefir section piqued Schwenk’s interest. Morell details the benefits of kefir in her book — and the ease of making it. Kefir is made by using kefir grains to culture raw milk. Because kefir can be cultured at room temperature, it takes only 24 hours to make. The taste of kefir is tart, flavorful and refreshing.
A few weeks after regularly drinking kefir, Holli began sleeping through the night and started gaining weight, a key developmental milestone for a premature baby. Schwenk was drinking kefir, too, and her health improved. Her blood sugar levels stabilized and she felt better than she had in years.
“I realized the answer to my prayers were in this jar that had billions and trillions of microorganisms in them that made me well. And I wanted to know why,” Schwenk says in a podcast with Kriben Govender, a food science and technology grad and founder of Gut Health Guru (Honours Degree in Food Science & Technology). “Microbes are where it’s at for me. They were my angels in disguise.”
Schwenk dove into the world of fermentation, making her own kefir, kombucha, cultured veggies and sourdough bread. She shares her DIY tips in her books and on her website Cultured Food Life. Schwenk’s developed a loyal following of fellow home fermenters. Her tips have helped fermented food brands launch their businesses, too.
Though she realizes many people are attracted to dairy-free water kefir, Schwenk is still a fan of milk kefir. She’s made vegan kefir, but says the greatest benefits are in milk kefir. She notes water kefir has 14 strands of bacteria and yeast, but milk kefir has over 50 strands.
“When you ferment it, it completely changes the food. You put vitamin C into it and more B vitamins, you add more probiotics, you remove the lactose. You transform the food by fermenting it. It’s a completely different food than regular dairy,” Schwenk says.
Vegan kefirs are finicky. While kefir grains must be fed daily with raw milk, vegan kefir must be fed more. There are few carbohydrates in a coconut milk kefir, for example, and the bacteria feed of the carbs to make probiotics. She suggests adding a date paste to vegan kefir.
Regularly drinking kefir is key for health benefits, she adds. Schwenk says many fermented foods have “transient bacteria” — bacteria that is good for the body, but doesn’t dwell in the stomach or organs. It only lasts 2-3 days. Consuming more fermented foods replenishes that transient bacteria.
Kefir is not the only fermented drink star with incredible health properties. Schwenk is passionate about kombucha, too. Kombucha is strong artillery against potential viruses because of the saccharomyces yeast strain found in the fermented tea. Saccharomyces is the No. 1 probiotic yeast strain used in hospitals worldwide because it cannot be killed by probiotics.
“That’s one of the strong things that makes kombucha stand out and do its job more effectively. It actually acts like a pathogen in the body and it attracts pathogens to it and kills them. But it only lasts a few days in the body,” Schwenk says. “That’s one of the powerful weapons kombucha has that’s such a benefit to our own bodies, our own lives, and keeps us healthy. If you have to take an antibiotic, kombucha is a great thing to help keep your body in balance because it doesn’t get killed by antibodies.”
The Second Brain
Gut flora is a balance. The gut is often referred to as the “second brain” — neurotransmitters and other chemicals produced in the gut affect the brain.
“We’re made up of trillions of bacteria. We’re basically a big sack of bacteria walking around. When I connected to that, I healed my body and my mind,” Schwenk says.
Overfermentation is a phenomenon which is a result of fermentation that lasted too long or had too much culture in it. Read on to get more insight on it and some tips on how to avoid it.
Time is Important!
Usually overfermentation happens when we leave the culture to ferment longer than recommended. For milk kefir that means more than 24 hours and for water 48 hours. With kombucha things are a bit more complicated, since there are very different approaches on how long it should ferment, depending on the individual taste. In our opinion, to make kombucha a great tasting beverage, it’s best to ferment it for 7-10 days.
So, if you exceed the recommended time of fermentation, it’s quite possible your culture will overferment. How will you know if this happened? By the look and taste of it.
The liquid that separates form thicker kefir is whey. It is rich with proteins.
Overfermented Kefir is More Potent
Just by the look you are able to see if overfermentation is happening in your milk kefir. It will become more curdled and you will see separation happening. The liquid whey will separate from more thicker kefir. Additional fermenting time will also change the taste, it will become more sour.
Water kefir will not change much in appearance. When water kefir is finished, it tastes a bit sweet still. If you prefer it more sour you can overferment it. If you leave it for a very long time it may become even to sour to drink.
The same is with kombucha. After long fermentation, it becomes more sour, even vinegar-like in taste. If you overferment kombucha you will also notice it becomes a bit more cloudy.
If you like more sour kombucha just leave it to ferment longer, more than a week.
Why This Happens?
We already mentioned one important factor that leads to overfermentation – time. If you leave the culture in milk/water/tea too long, it will overferment.
This is also connected to temperature of the environment. Higher temperature accelerates the activity of the microorganisms in the ferment. You will notice that in warmer seasons or if you have very warm interior in cold season, the fermentation can be finished even in half time.
Too much culture for the amount of milk/water/tea you are using. If you have more microorganisms in the ferment it’s only logical they will need more food. If you keep the volume of your ferment the same all the time, but the cultures multiply, the ratio will change noticeably. Again the fermentation will be ready faster. Note, it’s not recommended to overcrowd the grains, take away extras regularly. This will ensure activity and well-being of your cultures.
What to do When You Overferment?
If this was not intentional, you probably will not like the taste of kefir or kombucha once it’s overfermented. Here are some ideas what to do with it:
If it’s only slightly separated and you still like the taste, you can just stir it well then strain and use as always. But if the kefir is very curdled and dense, you will probably need a big colander, where you can gently stir the kefir and separate the grains.
If you don’t like the taste of overfermented kefir you can use it in smoothies or as ingredient in other dishes and baking recipes (pancakes with whey, brioche, muffins).
You can’t do much to change the taste of water kefir once it gets too sour. You can add sugar or other sweeteners. But maybe using it in smoothies or even for baking, would be better idea (ciabatta).
Water kefir gets more opaque if you ferment it for too long.
The same as with water kefir, you can use the sour kombucha in the smoothies or other refreshing drinks.
You can also leave it to ferment even longer until it gets really sour and then use it as a kombucha vinegar. This means fermenting it a few weeks not just days longer. Some also use this very sour kombucha as a natural cleaning product.
IS OVERFERMENTATION PROBLEMATIC?
Overfermentation basically happens when the grains don’t have enough food, the content of sugar has disappeared. Once all the food is gone the cultures starve. If this happens very often it can pose a threat for the cultures and they may stop growing and multiplying or producing fermented beverage. With fermentation, it’s important to feed the cultures regularly and this ensures having them for a lifetime.
KEFIRKO is a company that designs products for fermentation enthusiasts making their own kefir at home. They make glass jars with specialty lids for making a kefir drink and kefir cheese. KEFIRKO launched their product on Kickstarter 6 years ago, an idea “born from noticing how kefir preparation at home can be quite messy and complicated. Not something most of us would gladly do every day.”