Changes in gut microbiota composition following water kefir consumption in healthy adults.
de Mel R, Al Khafaji AH, Muthusamy S, Xu J, Håkansson Å
Fermented Foods
Fermenting plain sugar water into water kefir at home — the same low-tech craft as brewing tepache from fruit scraps or making a shrub from garden berries — appears to reshape your gut's microbial ecosystem within two weeks in ways researchers associate with a healthier digestive balance.
Scientists had 40 people drink a glass of homemade water kefir every day for two weeks, then compared the bacteria in their digestive systems before and after. The mix of microbes shifted noticeably: helpful groups became more common, including ones that make compounds thought to support gut health. The live cultures and plant-derived sugars in the drink seem to nudge the gut ecosystem in a positive direction, though how long those changes last is still unknown.
Key Findings
Bacteroidetes increased 21.6% and Actinobacteria 14.8%, while Firmicutes dropped 6.5% after just 14 days of 200 mL daily water kefir consumption.
Beneficial genera Bifidobacterium and Prevotella both increased, and the overall community structure shifted significantly (β-diversity, p = 0.025), indicating a real ecological change rather than random noise.
Short-chain fatty acid-producing species — Blautia spp. and Roseburia faecis — increased, pointing toward potential metabolic benefits, though 66% of participants noticed no change in digestive symptoms.
chevron_right Technical Summary
Drinking a daily glass of water kefir — a plant-based fermented beverage — for two weeks measurably shifted gut bacteria in healthy adults toward species linked to digestive health, including a 21.6% rise in Bacteroidetes and increases in beneficial genera like Bifidobacterium.
Abstract Preview
Fermented foods have gained increasing scientific interest for their potential to modulate gut microbiota and provide probiotic microorganisms with possible health benefits. This intervention trial...
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