Kombucha is a fermented tea drink with an acidic flavour and slight fizz, which is increasingly popular among the health-conscious. As kombucha has a low calorie and sugar content, it’s an excellent choice for consumers looking for an alternative to water, without any bad-for-you ingredients.1
In this article, we’ll explain what kombucha is, why it’s so popular, and investigate the health hype surrounding it. Then, we’ll hear what side effects kombucha has, and who might want to avoid this fermented beverage.
What is kombucha?
Kombucha is made from tea fermented with sugar and a bacterial culture called a SCOBY (symbiotic colony of bacteria and yeast). The fermentation process takes between 7 to 14 days.
Both green and black teas are used to produce kombucha. Homebrewers typically prefer to use black tea, as it ferments faster.
Black tea varieties typically have a deeper flavour. In contrast, green tea kombucha has a more delicate flavour and an almost grassy quality that some drinkers love.
Why is kombucha popular?
Fermented drinks have grown in popularity over the past decade as emerging science highlights the benefits of probiotics.2 The world consumed over 18 kilotonnes of probiotics in 2018!3 Kombucha has likely benefited from its association with the probiotic food trend. This fermented tea has become increasingly fashionable in the United Kingdom, so much so that an estimated 1,000 British pubs sell kombucha to health-conscious consumers.4
What is kombucha good for?
Kombucha has been linked to a whole host of health benefits. This is how kombucha can support you in your healthy lifestyle:
Source of probiotics
Fermented foods are made from bacterial cultures which produce probiotics during the fermentation process, and kombucha is no exception. Although probiotic content is linked to better health outcomes, no current evidence proves kombucha provides effective probiotics for health.5,6
Both green and black tea contains antioxidants called polyphenols, which have been linked to cardiovascular health.7 Although studies show kombucha’s fermentation process enhances tea’s antioxidant properties, there’s no conclusive evidence which proves kombucha’s polyphenol content positively impacts health.8
Vitamin and mineral content
Kombucha contains essentials minerals, including zinc, copper, magnesium, iron, nickel, and cobalt. Vitamins B1, B6, B12 and Vitamin C are also present.9
Potential kombucha side effects
Kombucha can cause adverse effects in some drinkers. These may include:10
- Stomach pain
- Allergic reaction
However, scientific studies show the majority of sufferers either had a pre-existing illness or drank a contaminated batch of kombucha.11,12
Who should avoid kombucha?
People with gastric and kidney complaints are more likely to suffer an upset stomach from drinking kombucha than non-sufferers.13 Pregnant women may choose to avoid kombucha because of the alcohol content. However, it’s thought to be too low a concentration to affect a foetus.
Last updated: 26 May 2021