Synopsis

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

Kefir, a fermented milk drink rich in probiotics, is increasingly used to support gut health during and after antibiotic therapy. Antibiotics can disrupt the natural microbiota of the gut, often leading to side effects such as diarrhea and other gastrointestinal disturbances. Scientific studies have shown that probiotic-rich foods, including kefir, may help restore the balance of gut flora. Several clinical trials and reviews have demonstrated that probiotics can reduce the incidence of antibiotic-associated diarrhea (AAD), though most research focuses on specific probiotic strains (such as Lactobacillus and Saccharomyces boulardii) rather than kefir specifically. However, kefir contains a diverse array of beneficial bacteria and yeasts, some of which overlap with those studied in clinical contexts.

Evidence supporting kefir’s efficacy is promising but not comprehensive. A few small studies suggest kefir may reduce the risk of AAD and promote faster recovery of the gut microbiome, but larger and more rigorous trials are needed to draw firm conclusions. Nonetheless, the use of kefir as a supportive dietary intervention during antibiotic therapy is based on a plausible scientific rationale and is supported by moderate evidence, especially considering its safety profile and general benefits for gut health.

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