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July 26, 2026Sources cited
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Culture & Lifestyle • Food & Drink

Kefir

Kefir is a fermented milk drink made by adding kefir grains, a symbiotic culture of bacteria and yeasts, to milk.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Kefir is a fermented milk drink made by adding kefir grains, a symbiotic culture of bacteria and yeasts, to milk. It is typically tangy, slightly effervescent, and similar in appearance and taste to a thin yogurt. Kefir is commonly made from cow, goat, or sheep milk and is widely discussed for its probiotic content and potential nutritional benefits.

What it is

Kefir is a cultured dairy drink made by fermenting milk with kefir grains. It is known for its tart flavour and drinkable consistency. It is typically thinner and more drinkable than yogurt, and is often described as sour or tangy with a slight effervescence.

How it is made

Traditional kefir is made by inoculating milk with kefir grains, which ferment lactose and create acidity, carbonation, and a small amount of alcohol. The grains are removed after fermentation and can be reused, making the process continuous.

Nutrition and health

Kefir can contain protein, calcium, B vitamins, and live microorganisms. It is commonly marketed and consumed as a probiotic food, and is associated with gut-health benefits, though health outcomes depend on the product and the individual. The strength of evidence for specific health claims varies.

Kefir and yogurt

Kefir and yogurt are both fermented milk products, but kefir is made with bacteria and yeasts, while yogurt is made primarily with bacteria. Kefir is usually thinner and more effervescent than yogurt, giving it a drinkable texture.

Key facts

  • Kefir is produced by fermenting milk with kefir grains, which contain a mix of bacteria and yeasts.
  • It is usually thinner and more drinkable than yogurt.
  • Kefir is often described as sour or tangy and may be lightly carbonated.
  • It is commonly marketed and consumed as a probiotic food.
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Canadian context

Kefir is widely available in Canadian grocery stores and is often grouped with probiotic dairy foods and cultured beverages in Canadian diets.

Frequently asked questions

What is kefir?
Kefir is a fermented milk drink made by adding kefir grains, which contain bacteria and yeasts, to milk.
What are the benefits of kefir?
Kefir is commonly valued for its probiotics and may provide protein, calcium, and B vitamins. It is often associated with digestive benefits, but the evidence for specific health claims varies.
How is kefir made?
Kefir is made by fermenting milk with kefir grains. The microbes in the grains ferment lactose, producing a tangy, slightly fizzy drink.
Is kefir good for you?
Kefir can be a nutritious food because it contains protein, calcium, and live cultures. Whether it is beneficial for a person depends on overall diet, tolerance, and the product’s ingredients.
What is the difference between kefir and yogurt?
Kefir is made with bacteria and yeasts and is usually thinner and more effervescent. Yogurt is generally made with bacteria only and has a thicker texture.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Kefir
    Supports: Definition, fermentation process, common milk sources, and general description of kefir.
  2. Mayo Clinic News Networkhttps://newsnetwork.mayoclinic.org/discussion/mayo-clinic-minute-what-is-kefir/
    Supports: Kefir as a fermented milk drink, nutrient content, probiotic association, and possible digestive benefits.
  3. Encyclopaedia Britannicahttps://www.britannica.com/topic/kefir
    Supports: Description of kefir, microbial cultures, origins, and general nutritional and probiotic context.
  4. Michigan State University Extensionhttps://www.canr.msu.edu/news/what_is_kefir
    Supports: Difference between kefir and yogurt, ingredients, and basic nutritional notes.
  5. WebMDhttps://www.webmd.com/diet/kefir-good-for-you
    Supports: General discussion of kefir, probiotic content, and differences from yogurt.