The #1 Fermented Food Gut-Health Experts Swear By

Your gut is home to trillions of bacteria that influence everything from your digestion to your immune health. With fermented foods gaining popularity as a natural way to support gut health, we turned to some gut-health experts to ask a simple question: What’s your go-to fermented food?

And the answer was (drumroll, please …) kefir! This tangy, creamy dairy-based drink consistently topped their lists, beating out options like kombucha, sauerkraut and even yogurt. But what makes kefir so popular with gut-health professionals?

The consensus was clear: kefir offers unique benefits that set it apart from other fermented foods. From its impressive probiotic diversity to its versatility, this fermented drink has earned its reputation as a gut-health powerhouse.

Why We Love Kefir for Gut Health

It Has Impressive Probiotic Diversity

When it comes to beneficial bacteria, kefir doesn’t mess around. Unlike some other fermented foods that contain a handful of probiotic strains, kefir delivers an impressive variety that your gut craves. “Kefir typically contains a wider range of bacteria and yeasts [versus yogurt], which means you’re introducing a wider variety of microbes to your gut microbiome—and variety is one of the most important factors for a resilient gut,” explains Will Bulsiewicz, M.D., MSCI.

This diversity matters more than you might think. Research shows that a varied gut microbiome is linked to better overall health outcomes. When you consume kefir regularly, you’re essentially giving your gut a diverse community of beneficial microorganisms to work with. Mascha Davis, M.P.H., RDN, emphasizes just how impressive this diversity can be: “Kefir can contain up to 30 different species of beneficial bacteria and yeasts. That diversity is a huge advantage because a more diverse gut microbiome is linked to better digestion, stronger immunity and even improved mood.”

These beneficial microorganisms work together in your digestive system, helping to crowd out harmful bacteria while supporting healthy digestion and immune function. 

It’s Naturally Lower in Lactose

If you’ve ever felt bloated or uncomfortable after drinking milk or eating dairy products due to lactose intolerance, kefir might be the dairy solution you’ve been looking for. “Kefir is a great option for many people’s guts because this drink is naturally lower in lactose thanks to the fermentation process, which lowers the amount of lactose,” says Amanda Sauceda, M.S., RDN.

“Some brands have kefir that is completely lactose-free, and it still comes with the probiotic benefits,” explains Sauceda.

It’s Packed with Essential Nutrients

Kefir isn’t just about probiotics; it’s also a nutritional powerhouse that supports your overall health while nurturing your gut. The fermentation process not only creates beneficial bacteria but also enhances the bioavailability of many nutrients. Sarah Schlichter, M.P.H., RD, highlights kefir’s impressive nutritional profile: “Kefir offers protein, calcium, B vitamins and some vitamin D.”

A single cup of kefir typically provides about 9 grams of high-quality protein, which may help promote satiety and support muscle health. The protein in kefir is particularly valuable because it’s complete, meaning it contains all nine essential amino acids your body needs. The calcium and vitamin D support bone health, while B vitamins play crucial roles in energy metabolism and nervous system function. 

It’s Simple and Convenient to Enjoy

One of the best things about kefir is how effortlessly it can fit into your routine, even on the busiest days. Unlike some gut-healthy foods that require special preparation or timing, kefir is quick and convenient. “Kefir is super easy to sip on—I like to have a glass first thing in the morning,” says Davis, pointing out how simple it can be to start your day on the right foot. If mornings aren’t your style, there are plenty of other ways to enjoy it. As Schlichter adds, “You can drink it straight up, add it to a smoothie or even add it to overnight oats.”

As an added bonus, kefir is available in many different flavors, which can be good options for those trying it for the first time. Just note that some of these flavored options are made with added sugar, which is an ingredient you may want to limit to support your gut health. 

Other Tips for Supporting Gut Health

While kefir is an excellent foundation for gut health, a comprehensive approach to digestive wellness is important. Here are additional strategies to maximize your gut health.

• Eat a rainbow of fiber-rich foods: Different types of fiber feed different beneficial bacteria in your gut. Aim for at least 25 to 35 grams of fiber daily from varied sources like vegetables, fruits, whole grains and legumes.
• Manage stress through regular practices: Chronic stress may disrupt gut bacteria balance and increase inflammation. Try meditation, deep-breathing exercises or regular physical activity to keep stress levels in check.
• Limit added sugars: These foods may promote inflammation in your digestive system.
• Get adequate sleep consistently: Poor sleep may disrupt gut bacteria. Aim for seven to nine hours of quality sleep each night to support both gut and overall health.
• Limit alcohol consumption: Excessive alcohol use can disrupt the balance of gut bacteria and increase inflammation in the digestive tract. If you do drink, consume alcohol in moderation to help your gut stay resilient and healthy.

Our Expert Take

Kefir truly stands out as a delicious and powerful ally for your gut. With its impressive diversity of probiotics, valuable nutrients and convenience, consuming kefir makes it easy to prioritize your digestive health every day.

If you’re looking to start a new habit that your body will thank you for, try adding a glass of kefir to your daily routine. Small, consistent changes—like sipping on this probiotic-rich drink—may lead to real improvements in your digestion, immunity and well-being over time.