Fermented foods and the microbiome: what's actually proven
Yogurt, kefir, sauerkraut — fermented foods have become trendy thanks to talk about the microbiome. Here is what research actually supports.
Interest in the gut microbiome has pushed fermented foods from 'traditional cuisine' into the mainstream of healthy eating — and not without scientific grounds.
What research shows
Studies, including ones from Harvard and Stanford, link regular consumption of fermented foods to positive changes in microbiome diversity and certain inflammation markers.
Which foods to add to your diet
- Yogurt and kefir with live cultures.
- Sauerkraut and kimchi — unpasteurized, since pasteurization kills the beneficial bacteria.
- Miso, tempeh, kombucha — in moderate amounts.
How to introduce them without discomfort
Start with small portions and increase gradually — suddenly adding a lot of fermented food to your diet sometimes causes temporary bloating.
More on digestion and wellbeing in "Gut health and wellbeing".
Questions and answers
Which foods count as fermented?
Yogurt, kefir, sauerkraut, kimchi, kombucha, miso and some cheeses — all go through fermentation by living cultures.
How much fermented food should you eat a day?
There's no strict rule, but a small regular amount — like a serving of yogurt or a bit of sauerkraut daily — already shows an effect in studies.
Can fermented foods cause bloating?
Yes, a sudden increase in amount can cause temporary discomfort — it's better to introduce them gradually.