From Instagram reels to grocery store cabinets, kombucha — the fizzy, fermented tea drink — has discovered a rising viewers amongst health-conscious customers in India. Promoted as a probiotic powerhouse, it’s touted for its supposed advantages to digestion, immunity, and metabolism. According to at least one estimate supplied by Indian firm Sbooch, the kombucha market in India grew from $45 million in 2020 to $102 million in 2024.
Yet a lot of the passion has outpaced science. While kombucha’s conventional use and composition counsel potential well being advantages, few rigorous research have examined these claims in people. Most analysis till now has targeted on kombucha’s biochemistry or has been restricted to animal fashions.
This is why a latest study in The Journal of Nutrition stands out: it takes a more in-depth have a look at kombucha’s results on the human gut microbiome and the way they matter for human well being.
The study adopted 46 wholesome adults in Brazil — 23 with weight problems and 23 of regular weight — over eight weeks in a pre-post trial. The members had been categorized utilizing (World Health Organisation cut-offs of) BMI and waist circumference. Every day, every participant consumed 200 ml of kombucha that had been ready in the lab utilizing black tea and fermented with a symbiotic tradition of micro organism and yeast (SCOBY).
All members had been in any other case wholesome and had no latest historical past of medicine, antibiotics or dietary supplements. Stool samples had been collected at first and finish to evaluate gut microbiome adjustments. The researchers used genomic instruments to profile bacterial and fungal communities.
They additionally measured fasting blood glucose, insulin, and proteins linked to gut barrier integrity since a weakened gut lining can permit dangerous molecules to enter the bloodstream, set off low-grade irritation, and in the end engender insulin resistance.
What we all know, what modified
After eight weeks, the general microbial variety was largely unchanged however the abundance of sure micro organism had modified in ways in which recommended kombucha could assist positively rebalance the gut ecosystem.
Chemical evaluation of the kombucha revealed a wealthy array of phenolic compounds, principally flavonoids (81%) and phenolic acids (19%). These polyphenols are largely unabsorbed in the small gut, reaching the colon the place they function fermentable meals for gut microbes. The authors recommended that they might promote the expansion of sure micro organism by stimulating the secretion of mucus and making a extra hospitable gut surroundings.
Notably, the inhabitants of Akkermansiaceae micro organism had elevated in people with weight problems. Previous analysis has linked this shift with higher blood sugar management and insulin sensitivity.
The ranges of Prevotellaceae additionally elevated, particularly in the overweight group. Certain strains of Prevotella copri have equally been linked to improved insulin sensitivity, hypertension, and irritation. Both teams additionally reported greater abundance of Bacteroidota, which play important roles in digesting complicated carbohydrates.
Bacteria related with much less beneficial outcomes together with Ruminococcus and Dorea declined, turning into just like the normal-weight group by the eighth week. Ruminococcus gnavus has been positively related with inflammatory bowel illness and liver fats accumulation, whereas Dorea with excessive BMI and ldl cholesterol markers.
In normal-weight members, Parabacteroides elevated modestly. Parabacteroides goldsteinii has been identified to scale back tissue irritation, ameliorating persistent obstructive pulmonary illness and Helicobacter pylori infections.
The populations of Exophiala and Rhodotorula, two fungi related with cystic fibrosis and weight problems respectively, decreased as properly.
While the study presents promising clues about kombucha’s affect, particularly for people with weight problems, the researchers urged warning. The microbial shifts had been modest and didn’t enhance metabolic markers like blood glucose, insulin, or inflammatory proteins.
Vineet Okay. Sharma, a metagenomics researcher at Indian Institute of Science Education and Research, Bhopal, famous that whereas most research in India have targeted on associations quite than causality, microbial shifts have been linked to metabolic adjustments in a number of circumstances. “For instance,” he mentioned, “production of metabolites by gut microbes, such as short-chain fatty acids, bile acids, or tryptophan derivatives, has been shown to influence glucose metabolism, inflammation, and gut barrier integrity.”
The group additionally identified that microbial responses range by food regimen, genetics, and total well being, thus lowering the generalisability of the findings. And with a brief period and a modest pattern measurement, the findings stay a proof-of-concept.
The outcomes are nonetheless precious in what they reveal, nonetheless: kombucha does seem to nudge the gut microbiome in instructions related with higher metabolic well being after two months.
Kombucha and India
Whether the consequences will maintain for Indian populations stays an open query. Studies have indicated gut microbiota in India are distinct. In considered one of Sharma’s research, Indian gut microbiomes fashioned a clearly separate cluster from Western populations.
Indian guts, notably amongst these consuming conventional plant-based diets, harbour extra Prevotella, an inversion of the standard Western microbial sample. Since consuming kombucha elevated Prevotellaceae abundance in the study, it might not drive the identical diploma of change in native populations.
“Even among Indians, microbiome composition varies with diet and location across the six regions we studied,” Sharma mentioned. While North Indians have extra Prevotella, South Indians carry the next load of Bacteroides and Ruminococcus. Women from rural high-altitude areas have better gut variety than their city counterparts. Ethnic tribes from Ladakh, Jaisalmer, and Khargone can be differentiated primarily based on their gut microbiomes alone.
Taken collectively, the brand new study is proof that no single model of kombucha can declare to be ‘good’ for all customers throughout geographies. The drink could help gut well being however whether or not that interprets to long-term metabolic advantages stays to be seen.
Anirban Mukhopadhyay is a geneticist by coaching and science communicator from Delhi.
