How sauerkraut affects digestion and immunity
Regularly eating sauerkraut may benefit digestion, gut microbiome health and immune function, though it is not suitable for everyone.
Sauerkraut is often seen merely as a side dish for meat or potatoes, but it contains fiber, vitamins and live beneficial bacteria known as probiotics, while being relatively low in calories. Research suggests that regularly including it in the diet can support digestion, help maintain a healthy gut microbiome and potentially reduce inflammation in the body.
Benefits for digestion and immunity
The probiotics created during fermentation, combined with fiber — about one gram per two tablespoons — help support regular bowel movements and lower the risk of constipation. Some studies indicate that eating sauerkraut regularly for six to eight weeks can also ease symptoms of irritable bowel syndrome, with this effect observed in people consuming both pasteurized and unpasteurized versions.
Sauerkraut also provides a notable amount of vitamin C — two tablespoons supply roughly 20% of the recommended daily intake. Vitamin C and other compounds in sauerkraut have antioxidant properties that help the body fight oxidative stress, which may be linked to a lower risk of inflammation-related conditions such as obesity, diabetes, heart disease and rheumatoid arthritis, though sauerkraut itself does not treat these illnesses.
The gut microbiome also plays a key role in regulating immune function, and an imbalance among its bacteria can promote inflammation. Probiotics in sauerkraut, particularly lactic acid bacteria, may help maintain a more balanced gut environment, indirectly supporting immunity, though effects on autoimmune conditions still require further research.
How to eat it and who should be cautious
Sauerkraut can be added to sandwiches, soups, salads, or eaten on its own. Some experts recommend unpasteurized versions found in store refrigerators, as they may retain more live bacteria, although study results on this remain inconclusive.
The product is not suitable for everyone, however — it contains relatively high sodium levels, so people on low-fiber or low-sodium diets should consult a specialist before adding it regularly. Overall, the greatest benefit comes when sauerkraut is part of a varied, balanced diet.
