Ashwagandha for Weight Management
Verdict: Published with Warning
Across 5 PubMed studies, the evidence for Ashwagandha in Weight Management grades Tier B — preliminary evidence. Effective, but with safety or population caveats.
B 🟡 B Preliminary Evidence Published with Warning
Why this grade7-layer evidence engine
⚖️
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.62
D
C
B
A
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← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
B · Published with Warning
Confidence
81%
Highly consistent evidence
Evidence level
E2
Multiple high-quality MAs (≥2 independent, consistent)
▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.617
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (1 篇 > 0 negative)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (5)L2 · primary research & systematic reviews
Efficacy and safety of Ashwagandha (Withania somnifera) root extract on stress and weight management in adults: a prospective, randomized, double-blind, placebo-controlled study
Finding: Over 24 weeks, ashwagandha root extract 600 mg/day reduced body weight by -8.46 +/- 3.86 kg and BMI by -3.31 +/- 1.57 kg/m2 versus -2.41 +/- 2.07 kg and -0.93 +/- 0.79 kg/m2 on placebo (both P < 0.0001; n=91 analyzed of 100 randomized).
View on PubMed Body Weight Management in Adults Under Chronic Stress Through Treatment With Ashwagandha Root Extract: A Double-Blind, Randomized, Placebo-Controlled Trial
Finding: In 52 chronically stressed adults, ashwagandha 600 mg/day produced significant improvements over placebo in perceived stress, food cravings, serum cortisol, body weight and BMI at 8 weeks, but the abstract reports no numeric effect size for weight/BMI and weight was only a secondary endpoint.
View on PubMed Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress - A systematic review and meta-analysis
Finding: Pooling 7 cortisol / 6 PSS RCTs (n=488), ashwagandha significantly lowered cortisol (-1.16 ug/dL, 95% CI -1.64 to -0.69, P < 0.001) but had NO significant effect on perceived stress (SMD -0.355, 95% CI -1.188 to 0.47, P = 0.40; I2 = 50.9%).
View on PubMed Investigating the Impact of Ashwagandha and Meditation on Stress Induced Obesogenic Eating Behaviours
Finding: A systematic-search narrative review of 51 studies concluded ashwagandha may support weight loss indirectly via reduced stress, cortisol and food cravings (HPA-axis/leptin-insulin pathways), but reported no pooled effect size and relied partly on pre-clinical data.
View on PubMed Effects of Ashwagandha Supplements on Cortisol, Stress, and Anxiety Levels in Adults: A Systematic Review and Meta-Analysis
— See PubMed for details
View on PubMed Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …
L4a US FDA
Cautious
WITHANIA SOMNIFERA ROOT source↗
L4d TW TFDA / 衛福部
Cautious
南非醉茄萃取物 source↗
L4e WHO
Neutral
WHO monographs on selected medicinal plants source↗
L5a NIH Office of Dietary Supplements
Cautious
ashwagandha extracts may lower stress, anxiety, and cortisol levels source↗
L5b Mayo Clinic
Neutral
Weight gain is not a commonly reported side effect of ashwagandha, and ashwagandha has not been studied as an aid to gain or lose weight, though a small study did find that it may help reduce food cravings in adults who are chronically stressed. source↗
L5c Cleveland Clinic
Cautious
Less cortisol can mean you feel less stressed mentally, and it can lessen the physical effects of stress. That could potentially help with things like headaches, high blood pressure, weight management and more. source↗