Cherries

Why It Matters for Longevity

Cherries -- particularly tart (Montmorency) varieties -- are among the highest food sources of anthocyanins. These polyphenols have demonstrated anti-inflammatory, antioxidant, and cardiovascular-protective effects in clinical trials. Cherries also contain melatonin in measurable quantities (~13.5 ng per gram in tart cherries), supporting circadian rhythm regulation alongside the Longevity Diet's emphasis on sleep quality.

Daily consumption of tart cherry juice (480 mL) significantly reduced systolic blood pressure and LDL cholesterol in older adults, with improvements attributed to anthocyanins and their effects on nitric oxide bioavailability and endothelial function (Kelley et al., 2018, Nutrients).

Tart cherry juice supplementation significantly reduced indices of muscle damage and inflammation including CK, LDH, muscle soreness, and strength loss following marathon running, consistent with the anti-inflammatory properties of cherry anthocyanins (Howatson et al., 2010, Scand J Med Sci Sports).

In water polo players, tart cherry juice supplementation significantly improved recovery of power output and reduced perceived fatigue between consecutive training sessions, confirming practical performance recovery benefits (McCormick et al., 2016, J Int Soc Sports Nutr).

Systemic Inflammation: CRP and Cytokine Evidence

Beyond the exercise-recovery context, tart cherry consumption has a measurable effect on resting inflammatory tone. A 2022 meta-analysis of 10 non-exercise RCTs found that tart cherry significantly reduced circulating CRP (WMD = −0.55 mg/L; 95% CI: −1.03 to −0.06; p = 0.029), while IL-6 and TNF-α were not significantly affected (Gholami et al., 2022, Complement Ther Med). A more granular GRADE-assessed meta-analysis of 21 RCTs replicated the CRP finding (WMD = −0.39 mg/L; 95% CI: −0.74 to −0.05; p = 0.024) and found a linear dose-response relationship: each additional 30 mL of tart cherry juice per day was associated with an additional −0.19 mg/L reduction in CRP (95% CI: −0.37 to −0.01), with blood pressure and heart rate unaffected at the doses studied (Norouzzadeh et al., 2023, Heliyon).

The CRP reduction of 0.4–0.6 mg/L is modest in absolute terms — comparable to the effect of modest aerobic exercise programs — but clinically meaningful as a dietary-only intervention with no adverse events. The underlying mechanism is anthocyanin-mediated suppression of NF-κB transcription, which governs hepatic CRP production. Cyanidin-3-glucoside, the dominant anthocyanin in tart cherries, inhibits NF-κB activation in endothelial and immune cells, reducing downstream inflammatory gene expression including CRP, intercellular adhesion molecule-1 (ICAM-1), and monocyte chemoattractant protein-1 (MCP-1).

Uric Acid and Gout

A systematic review of six clinical studies found consistent evidence that cherry consumption reduces both serum uric acid and the frequency of gout attacks. In the largest study included, 663 gout patients who consumed cherries for two or more days showed a 35% reduction in gout attack risk (OR = 0.65, 95% CI: 0.50–0.85) compared to those who ate no cherries. A separate controlled study in 26 overweight or obese participants found that tart cherry juice reduced serum uric acid concentration by 19.2% after four weeks (Chen et al., 2019, Evid Based Complement Alternat Med).

The mechanism involves anthocyanin inhibition of xanthine oxidase -- the enzyme responsible for uric acid synthesis -- as well as anti-inflammatory suppression of the NLRP3 inflammasome, which drives the acute gouty flare. A separate acute-dosing study (n=48) confirmed an 8% average decline in serum uric acid across formulation groups, with single powdered capsule doses showing the most sustained effect out to 24 hours (Hillman & Uhranowsky, 2021, Plant Foods Hum Nutr). The same study found no significant change in high-sensitivity CRP at these acute doses, suggesting the uric acid and anti-inflammatory pathways have different dose-response thresholds.

Sleep Quality

The melatonin content of tart cherries (~13.5 ng/g) is modest relative to therapeutic doses (0.5–5 mg), yet two independent RCTs show clinically meaningful sleep improvements. In 15 older adults with chronic insomnia, two daily servings of tart cherry juice reduced wake-after-sleep-onset from 78.9 to 62.1 minutes and increased total sleep time from 388 to 418 minutes compared to placebo; sleep efficiency improved from 79.2% to 82.9% (Pigeon et al., 2010, J Med Food). Effect sizes were moderate rather than large, placing cherry juice well below pharmacological hypnotics but relevant for a dietary intervention with no adverse events.

A follow-up mechanistic pilot study in eight adults with insomnia (crossover RCT) found that tart cherry juice extended sleep by 84 minutes on polysomnography (p=0.0182) and significantly reduced the kynurenine-to-tryptophan ratio (p<0.05). The kynurenine pathway explanation is more persuasive than melatonin alone: procyanidin B-2 in cherry juice inhibits indoleamine 2,3-dioxygenase (IDO), reducing tryptophan catabolism and thereby increasing substrate availability for serotonin and melatonin synthesis (Losso et al., 2018, Am J Ther). Prostaglandin E2, an inflammatory sleep disruptor, was also significantly reduced in the cherry juice arm.

The practical implication is that tart cherry's sleep effects likely arise from multiple converging mechanisms -- melatonin itself, tryptophan sparing via IDO inhibition, and reduced neuroinflammation -- rather than from any single compound acting in isolation.

How to Use It

Eat 100g fresh cherries as a dessert course or mix with yogurt. Use 20g dried tart cherries (no added sugar) as a portable snack. Tart cherry juice (240-480 mL) provides a concentrated anthocyanin dose for active individuals. For sleep support, consume 240 mL of unsweetened tart cherry juice one to two hours before bedtime, matching the timing used in the Pigeon et al. protocol.

What to Pair It With

Flavor Profile

Sweet, mildly tart, and fruity with a clean finish. Tart varieties are significantly more acidic and have a brighter, sharper flavour. Dried cherries concentrate sweetness and acidity. Aroma is floral and almond-like from the benzaldehyde present naturally in cherry flesh and pits.

The Science

• Kelley et al., 2018, Nutrients: Tart cherry juice (480 mL/day) reduced systolic blood pressure and LDL cholesterol in older adults with attributable effects to anthocyanins and their impact on endothelial function.
• Howatson et al., 2010, Scand J Med Sci Sports: Tart cherry juice supplementation significantly reduced muscle damage markers and strength loss following marathon running.
• McCormick et al., 2016, J Int Soc Sports Nutr: Tart cherry juice improved recovery of power output and reduced perceived fatigue between consecutive training sessions in competitive water polo players.
• Chen et al., 2019, Evid Based Complement Alternat Med: Systematic review of six studies -- cherry consumption associated with 35% reduced gout attack risk (OR=0.65) and a 19.2% reduction in serum uric acid in a controlled 4-week trial.
• Hillman & Uhranowsky, 2021, Plant Foods Hum Nutr: Acute Montmorency cherry ingestion produced an 8% average decline in serum uric acid across formulations; no significant change in CRP at acute dosing.
• Pigeon et al., 2010, J Med Food: Tart cherry juice reduced wake-after-sleep-onset by 17 minutes and increased total sleep time by 29 minutes in older adults with chronic insomnia.
• Losso et al., 2018, Am J Ther: Tart cherry juice extended sleep by 84 minutes on polysomnography; procyanidin B-2 inhibits IDO, preserving tryptophan for melatonin synthesis.
• Gholami et al., 2022, Complement Ther Med: Meta-analysis of 10 non-exercise RCTs -- tart cherry reduced CRP by WMD −0.55 mg/L (p = 0.029); no significant effect on IL-6 or TNF-α.
• Norouzzadeh et al., 2023, Heliyon: GRADE-assessed meta-analysis of 21 RCTs -- tart cherry reduced CRP by WMD −0.39 mg/L (p = 0.024) with a dose-response of −0.19 mg/L per additional 30 mL/day; blood pressure unaffected.

References

1. Kelley DS, Adkins Y, Laugero KD. A review of the health benefits of cherries. Nutrients. 2018;10(3):368. PMID: 29562604. doi:10.3390/nu10030368
2. Howatson G, McHugh MP, Hill JA, et al. Influence of tart cherry juice on indices of recovery following marathon running. Scand J Med Sci Sports. 2010;20(6):843-852. PMID: 19883392. doi:10.1111/j.1600-0838.2009.01005.x
3. McCormick R, Peeling P, Binnie M, et al. Effect of tart cherry juice on recovery and next day performance in well-trained water polo players. J Int Soc Sports Nutr. 2016;13:41. PMID: 27895542. doi:10.1186/s12970-016-0151-x
4. Chen PE, Liu CY, Chien WH, Chien CW, Tung TH. Effectiveness of cherries in reducing uric acid and gout: a systematic review. Evid Based Complement Alternat Med. 2019;2019:9896757. PMID: 31885677. doi:10.1155/2019/9896757
5. Hillman AR, Uhranowsky K. Acute ingestion of Montmorency tart cherry reduces serum uric acid but has no impact on high sensitivity C-reactive protein or oxidative capacity. Plant Foods Hum Nutr. 2021;76(1):91-97. PMID: 33506357. doi:10.1007/s11130-020-00878-y
6. Pigeon WR, Carr M, Gorman C, Perlis ML. Effects of a tart cherry juice beverage on the sleep of older adults with insomnia: a pilot study. J Med Food. 2010;13(3):579-583. PMID: 20438325. doi:10.1089/jmf.2009.0096
7. Losso JN, Finley JW, Karki N, et al. Pilot study of the tart cherry juice for the treatment of insomnia and investigation of mechanisms. Am J Ther. 2018;25(2):e194-e201. PMID: 28901958. doi:10.1097/MJT.0000000000000584
8. Gholami A, Amirkalali B, Baradaran HR, Hariri M. The beneficial effect of tart cherry on plasma levels of inflammatory mediators (not recovery after exercise): A systematic review and meta-analysis on randomized clinical trials. Complement Ther Med. 2022;68:102842. PMID: 35653966. doi:10.1016/j.ctim.2022.102842
9. Norouzzadeh M, Rashedi MH, Shahinfar H, Rahideh ST. Dose-dependent effect of tart cherry on blood pressure and selected inflammation biomarkers: A GRADE-assessed systematic review and meta-analysis of randomized controlled trials. Heliyon. 2023;9(9):e19987. PMID: 37809623. doi:10.1016/j.heliyon.2023.e19987

Key Nutrients