Sponsored by
Hello {{First Name|there}},
This week, we’re talking about the popular beliefs surrounding fermented foods and what new research is actually showing. Fermented foods like yogurt, kimchi, kefir, and sauerkraut are often celebrated for their “good bacteria,” with the idea that these live microbes are responsible for many of their health benefits.
But fermentation does more than introduce microbes. So, are the potential benefits of fermented foods coming from the live microbes themselves, what those microbes produce, or the food as a whole?
Two recent publications offer some interesting clues. A 2025 review in Nature Reviews Microbiology highlights just how diverse the microorganisms and fermentation products found in these foods can be. Then, a 2026 randomized trial of sauerkraut provides an intriguing real-world example of why the distinction between live microbes and fermentation-derived compounds may matter.
What Does Fermentation Actually Do to Food?
Fermentation is more than simply adding bacteria to food. During fermentation, microorganisms such as bacteria and yeasts break down components of the food, including carbohydrates, proteins, and other compounds.
In the process, they produce new substances such as organic acids, alcohols, gases, peptides, and other metabolites. These changes can alter a food's flavor, texture, digestibility, and nutritional composition.
What Counts as a Fermented Food?
“Fermented foods” is a surprisingly broad category:
🥛 Yogurt & kefir
🥬 Sauerkraut & kimchi
🫘 Miso, natto & tempeh
🍵 Kombucha
🧀 Cheese
🌾 Sourdough
Different microorganisms ferment different foods, producing different metabolites, or small molecules generated during the fermentation process.
What happens when fermented food is pasteurized?
Do Fermented Foods Need Live Microbes to Work?
It's easy to assume that the health benefits of fermented foods come primarily from the live bacteria they contain. And there is evidence that some fermented foods can influence the gut microbiome.
But much of the research linking fermented food consumption with better health outcomes comes from observational studies. These studies can identify associations, but they can't differentiate between the different components of the food that may be responsible for the potential benefits.
A 2026 randomized trial offers an interesting clue. Researchers gave 87 adults either fresh or pasteurized sauerkraut for four weeks. Both versions were associated with a small reduction in systolic blood pressure, despite pasteurization removing the live microorganisms.
This doesn't prove that fermentation-derived compounds are responsible, but it suggests that fermented food benefits may not depend entirely on consuming live microbes.
The takeaway
Fermented foods may benefit us for more reasons than simply delivering live bacteria. The microbes, the compounds they produce, and the food itself may all contribute.
The next question for researchers isn't simply “Are fermented foods good for you?” It's “Which fermented foods, which microbes, and which fermentation products actually matter?”
Best wishes,
- The Angiogenesis Foundation
P.S. Like what you’re reading? Support our mission to advance research and share science-backed health insights.
Make a donation to the Angiogenesis Foundation today.
Download our Free Bioactive Spotlight Guide to learn more about how to incorporate fermented foods it into your diet.
Don’t miss this weeks youtube video with our mascot Dr. Angio bringing complex health and research topics to life.
Check out the Angiogenesis Foundation Green Tea from Harney & Sons to support your vascular health.
Glass Skin Goals? Meet Your Morning Upgrade
Glass skin is the fall beauty goal: a complexion that looks smooth, plump and luminous. Pique’s Carrara Marine Collagen makes supporting that glow a delicious part of your morning routine.
After 90 days on Carrara, 83% reported smoother skin, 80% reported plumper skin and 86% reported greater skin satisfaction.
Each serving combines Type I marine collagen to support skin radiance with rare Type II collagen, sourced from wild Hokkaido salmon, to support elasticity. Together, they bring skin support into a daily ritual that feels like a treat.
Two scoops blend into morning matcha for a creamy latte, making consistency easy as fall schedules fill up. A warm cup, a quiet moment and nourishment from within become part of the same routine.
For anyone pursuing that luminous glass-skin look through sweater season, Carrara adds a beauty upgrade to a habit they already love.
