Synopsis

Source of validity: Traditional
Rating (out of 5): 3

Blueberry has been traditionally used in Europe to manage diarrhea, particularly the dried fruit of the bilberry (Vaccinium myrtillus), a close relative of the common blueberry (Vaccinium corymbosum). Historical records and folk medicine practices from Scandinavia and Germany note that dried blueberries or bilberries were consumed, often as a tea or puree, to treat mild, non-infectious diarrhea, especially in children. The basis for this use seems to be the high content of tannins and anthocyanins in the berries, which are thought to have astringent properties that can reduce intestinal inflammation and fluid secretion. Several small clinical studies have investigated bilberry or blueberry preparations for diarrhea, with some suggesting a reduction in symptoms, but the quality of evidence is limited and often confounded by small sample sizes or poor controls.

Modern scientific evidence for the use of blueberry in diarrhea is limited. While in vitro and animal studies indicate possible anti-inflammatory and antimicrobial effects of blueberry polyphenols, robust human clinical trials are lacking. Most authoritative guidelines do not recommend blueberry as a first-line treatment for diarrhea, but recognize its traditional use. In summary, the use of blueberry for diarrhea is primarily supported by traditional practice, with modest evidence from some small studies and plausible biological mechanisms, but stronger scientific validation is still needed.

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Other ingredients used for Diarrhea

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