kombucha
-
What is kombucha?
Kombucha is a beverage made from fermented green or black tea, typically consumed as a health food. This probiotic drink is created through a fermentation process involving various yeasts and bacteria, resulting in a slightly effervescent beverage with a mildly sour or vinegar-like flavor. It likely originated in China and spread along the Silk Road with tea. The kombucha culture, also known as SCOBY (symbiotic culture of bacteria and yeast), converts alcohols produced by the yeasts into organic acids. The final kombucha product contains vitamin C, vitamins B6 and B12, thiamin, acetic acid, and lactic acid, as well as small amounts of sugar and ethanol, depending on the length of fermentation.
1 Britannica SourceCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What ingredients are used to make kombucha?
Kombucha is a beverage made from fermented tea. The primary ingredients are green or black tea, sugar, and a symbiotic culture of bacteria and yeast (SCOBY).
To make kombucha, tea leaves are steeped in hot water with sugar, then removed. After the sweetened tea cools, kombucha from a previous batch is added to increase acidity. The SCOBY is added, and the mixture is fermented at room temperature for 7–30 days. The SCOBY contains various yeasts and bacteria, including Gluconacetobacter xylinus and Saccharomyces cerevisiae strains. The yeasts produce alcohols, which the bacteria convert into organic acids. The final product contains acetic and lactic acid, vitamin C, B vitamins, and small amounts of sugar and ethanol. Kombucha can be consumed plain or flavored with fruits, juices, spices, or herbs.
2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How is kombucha made through fermentation?
Kombucha is a beverage made from fermented tea. The fermentation process involves microorganisms, such as various yeasts and bacteria, resulting in a slightly effervescent probiotic drink with a mild sour flavor.
To make kombucha, tea leaves, typically green or black tea, are steeped in hot water with sugar. After the sweetened tea cools, it is mixed with kombucha from a previous batch to increase acidity. A SCOBY (symbiotic culture of bacteria and yeast) is added, and the brew ferments at room temperature for 7–30 days. During fermentation, the yeasts produce alcohols, which the bacteria convert into organic acids.
2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What is a SCOBY and what role does it play in kombucha?
A SCOBY, short for symbiotic culture of bacteria and yeast, is a gelatinous film that results from the kombucha fermentation process. It contains various yeasts and bacteria, including Komagataeibacter xylinus, Brettanomyces, and Saccharomyces.
In kombucha production, the SCOBY is added to sweetened tea, initiating fermentation over 7–30 days. The yeasts produce alcohols, which bacteria convert into organic acids, yielding a probiotic drink with a mild sour flavor. The SCOBY itself can be eaten or used to start new batches.
2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What flavors and variations can be found in kombucha?
Kombucha is a beverage made from fermented green or black tea with a mild sour or vinegar flavor. The drink can be consumed plain or mixed with fruit or fruit juices and fermented for a few more days for additional effervescence. It can also be flavored with spices and herbs. Many commercial brews are sweetened and flavored.
1 Britannica SourceCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What are some possible health benefits and risks of drinking kombucha?
Kombucha is a beverage made from fermented tea with a slightly sour flavor. It contains a variety of yeasts and bacteria and is consumed as a health food.
Reported benefits include support for digestion, a healthy gut microbiome, and immune system function. However, formal studies have not verified many of these claims.
Risks associated with kombucha consumption include food poisoning or other infections from contaminated home brews. Large amounts of kombucha have been linked to metabolic acidosis and liver damage. Kombucha is not recommended for individuals with compromised immune systems.
2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
kombucha, beverage made of fermented green or black tea, usually consumed as a health food. Kombucha is often brewed at home, though commercial products are increasingly available in many places. The fermentation process involves a number of microorganisms, including a variety of yeasts and bacteria, and the resultant probiotic drink is slightly effervescent with a mild sour or vinegar flavour. The tea has a number of reported health benefits, though there is little research to back many of those claims.
The exact origin of kombucha is uncertain, though it likely originated in China and spread with tea along the Silk Road. It is widely brewed in parts of eastern Europe, particularly in rural Russia, and is common in China and Korea. In the United States kombucha initially gained popularity during the HIV/AIDS epidemic in the late 1980s and early ’90s, as it was hoped that the drink could increase T-cell counts and support compromised immune systems. However, it fell out of favour following a report by the Centers for Disease Control and Prevention (CDC) in 1995 that linked the drink to two cases of severe metabolic acidosis, one of which was fatal. With greater awareness of probiotics and the possible health benefits of fermented foods, it resurged as a health product in the early 21st century, and home-brewing kits and commercial brews were soon readily available in many places.
In small-scale and home brewing, kombucha is typically made in glass jars topped with fabric. Black or green tea leaves are steeped in hot water with sugar, then removed. When the sweetened tea has cooled, it is mixed with a bit of kombucha from a previous batch to make the liquid more acidic. A gelatinous mat of symbiotic culture of bacteria and yeast (SCOBY) is then added, and the brew is covered with a tight-weave fabric or paper coffee filter and left to ferment at room temperature for 7–30 days.
" height="20" alt="HEW Logo">
The living components of SCOBY can vary widely but generally include strains of Saccharomyces cerevisiae and other yeasts, as well as a number of bacteria, including Gluconacetobacter xylinus. Fresh or dehydrated SCOBY can be bought from suppliers, or a “mother” can be taken from a previous batch of kombucha. In the fermentation process, the alcohols produced by the yeasts are converted by the bacteria into organic acids. The final kombucha product contains vitamin C, vitamins B6 and B12, thiamin, acetic acid, and lactic acid, as well as small amounts of sugar and ethanol, depending on the length of fermentation. The drink can be consumed plain or mixed with fruit or fruit juices and fermented for a few more days for additional effervescence. It can also be flavoured with spices and herbs. Many commercial brews are sweetened and flavoured. The SCOBY itself can be eaten fresh or dried and is sometimes used as a meat substitute.
Kombucha is said to be beneficial for a wide variety of conditions, including hair loss, arthritis, hypertension, inflammation, cancer, hangovers, and many other ailments, though few formal studies have been conducted to verify any of those claims. As a probiotic beverage with live cultures, there is some evidence that the drink may contribute to a healthy gut microbiome and support digestion and immune system functioning, though further empirical studies are needed.
The consumption of large amounts of kombucha has been linked to a number of serious illnesses, notably several cases of metabolic acidosis and liver damage. Additionally, there have been instances of food poisoning or other infections from contaminated home brews. The pasteurization of commercial brews limits this risk significantly, though the process renders any probiotic properties of the drink inert. Kombucha is not recommended for people with compromised immune systems, as the drink has been associated with severe bacteremia (bacterial infection of the blood) and fungemia (fungal infection of the blood) in such people.