Tart Cherry for Gout
Evidence that tart cherry lowers uric acid or prevents gout flares is weak and conflicting: the positive signal comes only from observational data, while the better-controlled trials found no benefit. It is not a reliable treatment, and acute gout still requires medication.
Why this grade7-layer evidence engine
The grade is held to weak, disputed evidence because the studies pull in opposite directions. The main positive signal is the Zhang 2012 case-crossover study (PMID 23023818, n=633), which linked cherry intake to fewer recurrent gout attacks, and a 2019 systematic review (PMID 31885677, n=941) that found a supportive association but whose heterogeneity prevented a pooled meta-analysis. Both are observational and rely on self-reported intake without serum urate data, so they can show association but not cause.
Crucially, the better-designed trials are negative. A 2020 dose-ranging randomized trial (PMID 31891407, n=50) found no effect of tart cherry concentrate on serum urate, urate excretion, or flare frequency at any dose, and a 2023 randomized trial (PMID 37679816, n=282) showed a tart cherry citrate mixture did not outperform comparators on uric acid. Controlled trials therefore do not confirm a urate-lowering or flare-reducing benefit.
Authorities are correspondingly reserved. Mayo Clinic and Harvard Health note only that some studies 'may' lower flare risk while stressing that diet rarely lowers urate enough to treat gout; rheumatology guidelines make no recommendation, citing low certainty. Regulators are stricter still: the US FDA has acted against cherry products marketed as treating gout, treating such claims as unapproved drug claims, and EFSA has authorised no EU health claim. Cherries are safe to eat, but should be seen as a minor adjunct, not a therapy.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸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 = 0.51
- 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 2 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status