Gut & Microbiome
kombucha causes weight loss
In plain terms: Does kombucha help you lose weight?
Part of: • kombucha
The one human trial that measured it found no weight loss. A 10-week RCT in people with excess weight saw no drop in weight (it nudged a couple of markers); anti-obesity effects otherwise exist only in cells and animals. Not a weight-loss drink.
🧭 Read this score with how it was built in mindA study was counted on an outcome it never measured
Two of the studies here are not two studies. They are one 59-person, 10-week randomised trial of green tea kombucha, published twice by the same researchers with different results in each paper: the 2024 paper reported weight, inflammation and oral bacteria, and the 2026 paper reported cholesterol and blood-sugar markers. Only the 2024 paper measured weight at all — the 2026 paper mentions weight solely to describe who was enrolled. It had been counted as a second study finding no weight benefit, which overstated how much evidence we actually hold. It no longer votes here. The direction of the finding has not changed: the one trial that did measure weight found kombucha added nothing to calorie restriction. We are simply no longer counting that single trial twice.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Human trials (RCT / n-of-1)
How the studies fall
What the evidence shows
The one human trial that actually measured it found NO weight loss. A 10-week RCT of green-tea kombucha in people with excess weight did not enhance weight loss (it did nudge some metabolic markers); anti-obesity effects otherwise live only in cell and animal studies. Not a weight-loss drink.
The evidence (6)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Fraiz GM, Bonifácio DB, Lacerda UV, Cardoso RR, Corich V, Giacomini A, Martino HSD, Echeverría SE, Barros FAR, Milagro FI, Bressan J 2024 · Nutrients | RCT | contradicts | moderate | RCT in adults with excess weight: green-tea kombucha did NOT enhance weight loss over 10 weeks. |
| Liu Y, Zheng Y, Wang W, Wang Z, Han S, Zhou P 2024 · J Food Sci | animal | mixed | low | In-vitro/animal: kombucha inhibited digestive enzymes and reduced adiposity (preclinical anti-obesity, unconfirmed in humans). |
| Permatasari HK, Firani NK, Prijadi B, Irnandi DF, Riawan W, Yusuf M, Amar N, Chandra LA, Yusuf VM, Subali AD, Nurkolis F 2022 · Clin Nutr ESPEN | animal | mixed | low | Obese rats (kombucha + sea grapes combo): reduced adiposity (combination product, animal). |
| Costa MAC, Vilela DLS, Fraiz GM, Lopes IL, Coelho AIM, Castro LCV, Martin JGP 2023 · Crit Rev Food Sci Nutr | observational | supports | low | Systematic review: in-vitro/animal studies suggest anti-obesity effects — but this preclinical signal has not been confirmed in humans. |
| Liu Y, Li M, Pan M 2026 · Front Nutr | animal | supports | low | High-fat-diet mice (kombucha soymilk combo): metabolic benefit from a combination product. |
| Bonifácio DB, Fraiz GM, Lacerda UV, Cardoso RR, de Souza Coura Dias T, Corich V, Giacomini A, de Barros FAR, Bressan J 2026 · J Food Sci | RCT | contradicts | low | OFF-SCOPE for a weight claim: this paper reports no weight endpoint. Its measured outcomes are lipids, uric acid and glycaemia - 'participants in the kombucha group showed a significant reduction in total cholesterol (p = 0.024), LDL-c (p = 0.035), VLDL-c (p = 0.011), triglycerides (p = 0.012), Castelli index II (p = 0.002), and uric acid (p = 0.027) compared to baseline' - and the words body weight and BMI appear only as population descriptors ('individuals with excess body weight', 'BMI >27 kg/m2'), never as results. It is also the SAME 59-participant, 10-week, 200 mL/day trial as PMID 39339787, which is the paper that did measure weight. Note for whoever homes this correctly: on a cholesterol claim its honest reading is a between-arm NULL, because 'in the total sample, no significant differences were found between the control and kombucha groups (p > 0.05) for any evaluated marker' - the baseline-comparison reductions above are within-arm changes on an energy-restricted diet, which is not an effect of kombucha. |
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.