May 23, 2026, 6:00 a.m. ET
If you browse through Instagram or TikTok, you’ll likely encounter an endless array of health trends boasting various benefits. From green powders and cold plunges to protein-packed snacks and gut-friendly drinks, influencers constantly promote the latest “must-have” food or supplement for enhancing well-being.
Among these are fermented foods, frequently touted for their supposed importance in our diets. However, many people exaggerate their necessity. “Fermented foods don’t have to be a trend or an all-or-nothing choice,” says Amy Goodson, a nutritionist and registered dietitian at The Sports Nutrition Playbook. Instead, think of them as a “small, flavorful addition to an already balanced meal.”
Let’s explore what fermented foods are, their benefits, and important considerations for incorporating them into your diet.
What are Fermented Foods?
Fermented foods undergo a natural transformation wherein microorganisms like bacteria, yeasts, or molds convert carbohydrates (such as sugars and starches) into acids, gases, or alcohol, explains Caroline Susie, a registered dietitian and national spokesperson for the Academy of Nutrition and Dietetics.
This process not only preserves food but also alters its flavor and texture while producing beneficial bacteria, according to Goodson.
Familiar examples of fermented foods include yogurt, kefir, sauerkraut, kimchi, aged cheeses like cheddar and gouda, as well as miso, tempeh, kombucha, soy sauce, authentic sourdough bread, and specific pickles.
While some of these foods are traditionally fermented using live cultures, others are produced through commercial processes. Susie emphasizes the importance of reading food labels because some commercial varieties may use vinegar or heat processing, which can destroy beneficial bacteria.
Health Benefits of Fermented Foods
One of the most recognized advantages of fermented foods is their contribution to gut health through probiotics, which are beneficial bacteria.
During fermentation, these helpful microbes can develop, and when consumed, they may support the intricate ecosystem of microorganisms in the digestive tract, known as the gut microbiome.
Moreover, fermentation can enhance the digestibility of various foods, improving nutrient absorption. Goodson highlights that fermentation boosts the availability of nutrients like B vitamins and minerals, such as calcium and iron, which can be less accessible in their natural forms.
These foods may also bolster immune function, as a balanced gut microbiome plays a vital role in regulating immunity.
Susie refers to emerging studies on the gut-brain connection, suggesting that probiotics from fermented foods may affect mood and anxiety through the production of neurotransmitters and anti-inflammatory compounds. Research indicates that certain strains from fermented foods might even have positive effects on memory and attention, though further human studies are needed.
Can You Consume Fermented Foods Daily?
For most people, incorporating fermented foods into their daily diet is safe. However, there are noteworthy exceptions to keep in mind.
Goodson advises that those with histamine intolerance might experience headaches or digestive issues upon consuming fermented products, as these foods can be high in histamines.
Additionally, those on monoamine oxidase inhibitors (MAOIs), which are medications used to treat specific mental health conditions, should limit their intake of fermented foods.
Individuals with weakened immune systems are also at a higher risk for foodborne illnesses, leading the U.S. Centers for Disease Control and Prevention to recommend avoiding unpasteurized fermented products.
Another factor to consider is sodium level. Fermented foods like sauerkraut, kimchi, and pickles can be high in salt, which may pose a concern for those managing hypertension or heart disease, according to Goodson.
Moreover, Susie points out that individuals with certain digestive disorders, like small intestinal bacterial overgrowth (SIBO), may need to exercise caution, as fermented foods can occasionally worsen symptoms such as bloating and gas.
Nevertheless, for the majority, when consumed in moderation, fermented foods can be a valuable addition to a healthy diet.
