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Fermentation, in simple terms, is the process in which live bacteria, yeasts, or other microorganisms alter food. This natural process has been used by humans for centuries, offering both culinary advantages and nutrition. Fermented foods play a central role in diets worldwide. From kimchi in Korea to kefir in the Middle East and sauerkraut in Germany, people all over the globe have long embraced the taste and health benefits of fermenting foods and beverages.
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Fermentation is also the key method used to create some of our favorite and most famous foods, such as alcohol, yogurt, and sourdough bread. Over the last 15 years, fermented foods have gained traction in the U.S. for their outstanding health benefits, particularly in promoting a healthy gut microbiome. If you haven’t yet, it’s time to discover the ancient benefits of fermentation.
Top Fermented Foods for a Healthier Gut
With so many fermented foods available, it can be hard to know where to begin. Here’s a list of nutrient-rich fermented foods that are commonly found in grocery and health food stores, all of which contribute to a balanced digestive system.
1. Kefir
Kefir is a fermented milk beverage that has a yogurt-like tang but with a stronger flavor. It contains even more probiotics and protein than regular yogurt and can be made from dairy or plant-based alternatives like almond or coconut milk.
2. Sauerkraut
Greg Dupree
You might have first encountered sauerkraut, the tangy German dish made from fermented cabbage, at a summer barbecue, typically served as a topping for hot dogs. However, what many don’t know is that naturally fermented kraut—essentially cabbage submerged in a saltwater brine—is packed with beneficial probiotics, fiber, and vitamins. In fact, one study revealed that a single batch of sauerkraut could contain over 220 different strains of bacteria that are great for your gut health. Who knew a condiment could be so nutritious?
3. Kimchi
Linda Pugliese
Kimchi is a fundamental side dish in Korean cooking, traditionally made with fermented cabbage and a variety of other vegetables, often including fermented fish. Much like sauerkraut, this spicy condiment is packed with beneficial probiotics, along with a bold punch from the classic combination of ginger, garlic, and gochujang (a Korean chili paste). Kimchi not only adds an explosion of flavor to any dish but is also loaded with a variety of healthy nutrients.
4. Tempeh
Greg DuPree
While many are acquainted with tofu, a neutral-flavored soybean product created from the pressed curds of cooked soy milk, tempeh is slightly different. It's made from fermented whole soybeans, and it can serve as a substitute for tofu in various dishes. To make tempeh, soybeans are fermented and compacted into a firm cake that can be marinated, baked, grilled, or stir-fried. The fermentation process breaks down the soybeans' proteins into amino acids, which are easier for our bodies to absorb, making tempeh a plant-based nutritional powerhouse.
5. Kombucha
Greg DuPree
Kombucha is a lightly carbonated beverage made by fermenting a mixture of sugar and tea, transforming it into kombucha with the help of a symbiotic culture of live bacteria and yeasts (S.C.O.B.Y.). This zesty drink is not only flavorful but also widely available in stores and online, offering a range of fun flavors. (It even doubles as a cocktail ingredient!) Beyond probiotics, kombucha provides extra health benefits thanks to the polyphenols found in the green or black tea used to brew it. Polyphenols are present in all teas, but the fermentation process boosts their effectiveness, making kombucha a fantastic source of these powerful antioxidants.
6. Miso
Caitlin Bensel
Miso, also known as miso paste, is a rich, fermented paste created from a starter culture called koji, soybeans, salt, and plenty of time. To maximize the probiotic benefits of miso, use it raw or add it toward the end of your cooking. The savory, umami flavor of miso-marinated vegetables and proteins, miso-based soups, or miso-infused dips and dressings is truly unbeatable.
7. Yogurt
Victor Protasio
All dairy-based yogurts, including standard yogurt and Greek yogurt, are fermented dairy products created by introducing bacteria into heated milk and allowing it to sit for several hours, during which the bacteria transform the lactose (sugars) into lactic acid, giving it a thick and tangy consistency. (Greek yogurt is simply a more strained version, making it even thicker.) As such, yogurt made from dairy milk is a fantastic source of probiotics, promoting a balanced and healthy microbiome. Additionally, yogurt is rich in protein and essential minerals like potassium and calcium.
8. Cottage Cheese
Cottage cheese is a dairy product that often flies under the radar but truly deserves more recognition! Packed with protein and calcium, this smooth, cultured cheese has a mild, creamy texture, similar to the inside of burrata, and pairs wonderfully with both fruit salads and savory dishes. However, not all cottage cheese brands contain probiotics, so be sure to check for the label “Live Active Cultures” on the container or nutrition facts.
9. Labneh
Jennifer Causey
Labneh is an incredibly thick and creamy cheese from the Middle East, made by straining yogurt (even more than Greek yogurt). You can purchase labneh pre-made, ready to spread or dip, or make your own by straining whole-fat plain yogurt, preferably overnight, until it reaches a smooth, cream-cheese-like consistency. If your labneh is made from yogurt with live active cultures and hasn't been heated, each bite will offer a dose of probiotics.
10. Buttermilk
Amy Neunsinger
Did you know you can enjoy buttermilk on its own—or that it offers a boost of gut-friendly microorganisms? Not many people are aware! Traditionally, during the butter-churning process, the leftover liquid that didn’t become butter—also called buttermilk—naturally thickened and gained a tangy flavor due to the presence of live bacteria. Today, buttermilk is intentionally made on a much larger scale by adding bacteria to milk. As long as it’s consumed without heating—try it in smoothies, dressings, or dips—this cultured milk product is full of probiotics, calcium, protein, and is often fortified with additional vitamins and minerals.
11. Fermented Pickles (or Sour Pickles)
While not all pickles are fermented, many are simply pickled or brined in a mixture of salt, vinegar, water, and sometimes sugar, along with other spices. These traditional pickles are tasty but don't contain live bacteria. On the other hand, pickles that go through lacto-fermentation, such as sour pickles, offer probiotic benefits. How can you identify them? The packaging will typically indicate if the pickles have been naturally fermented.
The Advantages of Fermented Foods
Fermentation is a natural process in which bacteria convert sugars (carbohydrates) in food into simpler forms like alcohol or acid. In the case of fermented foods, live bacteria that produce lactic acid break down the food, making its nutrients more accessible to the body while also producing probiotics.
Probiotics have been shown to support a healthy gut microbiome, making fermented foods a powerful tool in promoting digestive health. Additionally, since gut health influences overall well-being—affecting everything from immunity to brain function—regularly consuming fermented foods can contribute to protecting against various health issues, from heart disease to arthritis.
Fermented Foods vs. Pickled Foods
The key difference between these foods lies in their fermentation process. Health benefits are typically associated with naturally fermented foods, which are distinct from foods that are merely pickled with vinegar. While both are ancient preservation techniques, only naturally fermented foods—those that involve live organisms during fermentation—offer the probiotic boost essential for digestive health. Fermented items are always found in the refrigerated section of stores and should be labeled as ‘naturally fermented’ or ‘live, active cultures.’
How Frequently Should You Consume Fermented Foods?
One study showed that individuals who ate about six servings of fermented foods daily had better microbiome diversity and lower levels of inflammation. However, consuming this quantity regularly can be challenging, as not everyone can tolerate such frequency or volume.
If you're new to probiotics, it's crucial to begin gradually,” suggests registered dietitian Christina Manian, RDN, who recommends starting with one to two servings of fermented foods per day. However, for even better gut health, she advises that the more, the better. “Three or four servings, or even more, will truly enhance your gut health,” she notes.
In his bestselling book, *The Art of Fermentation*, Sandor Katz offers advice: 'Enjoy fermented foods and beverages in moderation. They have potent effects and strong flavors, so they deserve respect. Eat them regularly, but in smaller amounts.'
Frequently Asked Questions
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Are there any risks associated with consuming fermented foods?
One unexpected concern is the potential alcohol content, especially in beverages like kombucha. “Alcohol production is a natural part of fermentation, but whether you're brewing at home or purchasing fermented products, the alcohol content may be higher than expected or advertised,” says Manian. She references a 2020 study by the British Columbia Centre for Disease Control, which tested nearly 700 kombucha samples from various well-known brands, revealing that 32% of bottles contained 1–3% alcohol by volume (ABV). This is significant, considering that even beer may have as little as 4% alcohol.
To minimize this risk, Manian recommends keeping fermented foods as cold as possible. “As temperatures rise, yeast becomes more active, which leads to increased alcohol production,” she explains.
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Who should avoid fermented foods?
Fermented foods are generally safe and beneficial for most people. However, Manian advises pregnant women and those sensitive to alcohol to be cautious, as fermented foods can sometimes contain varying alcohol levels. Additionally, some fermented items tend to have higher histamine levels than fresh foods, which may trigger allergic reactions in some individuals. “Anyone prone to allergies should start with small amounts,” she cautions. Also, some fermented products, such as miso paste, can be high in sodium, so those on sodium-restricted diets should review nutrition labels before consuming.
