Fermented Foods Keep Working Even After the Bacteria Stops
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Gut Feeling: Kimchi and yogurt are known as gut-friendly foods because they contain probiotics. But a new review from Saudi Arabia suggests those live cultures may be getting too much credit, and that the compounds the bacteria leave behind are what’s really beneficial.
The Study: In this narrative review published in Frontiers in Nutrition, a researcher examined more than two decades of studies on fermented foods and metabolic health. As microbes ferment food, they break it down into new substances called postbiotics (short-chain fatty acids that help strengthen the gut lining). These compounds stay biologically active even after the microbes that made them have died.
The Takeaway: This means foods like pasteurized sauerkraut can still do you some good. And eating a variety of fermented foods across categories (think everything from kefir to miso) gives you a wider range of these compounds. Pairing them with fiber-rich plants will get you bonus points, since your gut bacteria feed off the roughage.
Keep in Mind: Some of the most dramatic results come from animal studies, which don’t always hold up in people. How much you benefit may also depend on the bacteria already in your gut.
