Supplements
quercetin decreases body weight
In plain terms: Does quercetin help you lose weight?
Part of: 🧪 quercetin
No. A meta-analysis of seven trials found no change in BMI or body fat. The one positive human result was under 1.5 kg over 12 weeks, with a spread wider than the effect itself.
📅 Last reviewed: 2026-07-26 ⓘ
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: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
The human evidence points against a meaningful effect. A meta-analysis of 7 RCTs (540 patients) found NO significant change in BMI or body fat, and a separate n=110 RCT found no body-composition difference. The one positive human trial, in fatty-liver patients, reported 1.5 kg lost versus 0.2 kg on placebo over 12 weeks — with a standard deviation larger than the effect itself.
The evidence (11)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Tan Z, Chen Y, Peng Y, Tang Y, Sun B, Zhou J, Zhou Y, Li O, Peng C, Chen X 2025 · Frontiers in bioscience (Landmark edition) | animal | contradicts | low | Meta-analysis of 9 preclinical studies (2000-2024) in tumor-bearing mice: quercetin inhibited HCC tumor growth and reduced mortality but showed 'no significant effect on body weight'. Animal-only, and the population is cancer-cachexia mice |
| Mazangi H, Panahi N, Hesaraki S, Safi S 2025 · Iranian journal of pharmaceutical research : IJPR | animal | mixed | low | HFD rats (n=30, 8 weeks, 3 arms: Qu, avocado-oil nanoemulsion (NAO), or combined NAOQu): the combination NAOQu 'significantly reduced body weight' and improved lipids/testosterone, but the abstract does not separately report whether quercet |
| Chen Z et al 2026 · Research Square | animal | contradicts | low | Unreviewed preprint of the same diabetic-neuropathy study as pmid:42259981: STZ-diabetic rats, 12-wk quercetin, 'without significantly altering blood glucose or body weight'. Duplicate of an already-counted animal result — should not be dou |
| Jin D, Jin S, Zhou T, Sheng G, Gao P, Li G 2025 · Food science & nutrition | meta-analysis | contradicts | moderate | Meta-analysis of 7 human RCTs (540 MASLD patients, dose/duration heterogeneous): quercetin improved liver enzymes and lipid profile but had 'no significant effects on kidney function, BMI, body fat...'. GRADE certainty ranged very low to mo |
| Saied MA, Yousuf SA, Rahman MA, Islam KMS, Agustono B, Chowdhury R 2026 · Journal of advanced veterinary and animal research | animal | contradicts | low | Ross 308 broiler chicks (180 birds, 5 reps of 9/group) fed dietary quercetin 0, 0.40, 0.80 or 1.20 g/kg for the full grow-out period showed dose-dependent INCREASES in feed intake and body-weight gain, greatest at 1.20 g/kg (p<=0.05) -- the |
| Sagi SSK, Kirar V, Prasad J, Singh S, Rathi V, Sultana K, Singh VK, Verma SK, Kumar D, Kumar V, Saxena S, Mishra R, Singh VV, Chopra S, Varshney R 2026 · European journal of nutrition | RCT | contradicts | moderate | Human RCT, 110 healthy lowland men, 500 mg/d quercetin bar vs placebo for 15 days during high-altitude ascent: reduced acute mountain sickness incidence/severity, but 'no significant differences...in body weight, fat mass, fat percentage... |
| Lotify MA, Abdelgayed SS, Mohamed HRH 2026 · Scientific reports | animal | supports | moderate | Male Wistar rats, HFD-induced obesity, oral quercetin or nanoquercetin at 10% of safe dose for 4 wk (36 rats, 6 groups): in obese rats, quercetin/nanoquercetin 'significantly reduced body weight' and improved lipids/adipokines, but in non-o |
| Chen Z, Peng B, Zhao L, Huang Z, Chen M, Zheng S, Jiang Y, Zhou L, Li X 2026 · Chemico-biological interactions | animal | supports | moderate | HFD-fed C57BL/6 mice: quercetin 'dose-dependently attenuated body weight gain and reduced white adipose tissue expansion without altering food intake', mechanistically via AMPK-DAPK3-ULK1-driven lipophagy validated in 3T3-L1 adipocytes. Ani |
| Onaolapo A et al 2026 · Research Square | animal | mixed | low | Wistar rats (n=6/group) on a high-fat/high-sugar diet +/- quercetin 100 or 200 mg/kg (28-day protocol vs metformin comparator) had HFHS-induced body-weight increase among the measured parameters, but the results sentence on quercetin's bene |
| Li N, Cui C, Xu J, Mi M, Wang J, Qin Y 2024 · The American journal of clinical nutrition | RCT | supports | moderate | Human RCT crossover, 36 NAFLD patients completed, 500 mg/d quercetin vs placebo for 12 wk each: body weight fell by a mean 1.5±2.6 kg and BMI by 0.5±0.9 kg/m² vs 0.2±1.8 kg / 0.1±0.7 kg/m² with placebo (adjusted P=0.038 both) — a fraction-o |
| Chen Z, Li Z, Xue X, Song W, Zhang R, Wang C, Yan B, Sun Q, Wu Q 2026 · Naunyn-Schmiedeberg's archives of pharmacology | animal | contradicts | moderate | STZ-induced diabetic rats given quercetin for 12 weeks: improved pain thresholds and sciatic nerve pathology 'without significantly altering blood glucose or body weight' — a clean null on body weight in a diabetic (not obese) rat model. |
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.