NutriDex

The Supplement Research Compendium
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Olives

Olea europaea

Brined Mediterranean fruit rich in oleic acid and polyphenols

Moderate evidence 🍎Fruits

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
9 verified / 9
Classification
Fruits
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.

Nutrition per serving 1 serving (15 g, ~5 medium olives)

15gSERVING
  • Water 12 g80%
  • Fibre 0.5 g3%
  • Other carbs 0.5 g3%
  • Protein 0.1 g1%
  • Fat 1.6 g11%
  • Other 0.3 g2%
What's in one serving, by weight — average composition (USDA).
Total fat2%Sodium5%Fiber2%Vitamin E2%Iron3%Calcium1%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
17 kcal0.13 g protein0.48 g fiber1.6 g fat
NutrientPer serving% daily value
Total fat1.6 g2%
Sodium110 mg5%
Fiber0.48 g2%
Vitamin E0.25 mg2%
Iron0.49 mg3%
Calcium13 mg1%
Copper0.04 mg4%
Vitamin A3 mcg RAE0%

Composition data: USDA FoodData Central ↗

What is Olives?

Olives (Olea europaea) is a fruit used for cardiovascular support: olive intake (and olive oil from the same fruit) is associated with lower risk of cardiovascular disease in large prospective cohorts. NutriDex grades the human evidence as Moderate. The human evidence for olives sits largely within the broader olive-fruit/olive-oil and Mediterranean-diet literature rather than table olives studied in isolation. Large prospective cohorts and meta-analyses consistently link higher olive oil consumption to lower cardiovascular disease and all-cause mortality (roughly 15-16% lower CVD risk per ~25 g/day, with benefit plateauing near 20 g/day), and the PREDIMED randomized trial showed a Mediterranean diet supplemented with extra-virgin olive oil reduced major cardiovascular events. Randomized crossover trials (e.g., EUROLIVE) demonstrate that the phenolic fraction—hydroxytyrosol and oleuropein—modestly raises HDL and lowers oxidized LDL in a dose-dependent manner, and olive-leaf extract RCTs and meta-analyses show small but real reductions in systolic blood pressure and triglycerides. However, most high-quality trials use olive oil or concentrated olive-leaf extracts, not whole brined table olives, so direct causal evidence for table olives specifically is limited and effect sizes are modest. Table olives also carry a large sodium load from brining that is absent from olive oil, which complicates extrapolation. Overall the evidence is best graded moderate: biologically plausible, supported by consistent observational data and supportive mechanistic RCTs, but with limited whole-fruit-specific trials.

Purported Benefits

✓Cardiovascular support: olive intake (and olive oil from the same fruit) is associated with lower risk of cardiovascular disease in large prospective cohorts
✓Improved lipid profile: olive/olive-leaf polyphenols modestly raise HDL and lower triglycerides and oxidized LDL in RCTs
✓Blood-pressure lowering, shown for olive-leaf extract (oleuropein-rich) in randomized trials, especially in hypertensive adults
✓Antioxidant activity: hydroxytyrosol and oleuropein reduce LDL oxidative damage in human crossover studies
✓Anti-inflammatory effects: reductions in CRP and select inflammatory cytokines reported with olive polyphenols
✓Source of monounsaturated fat (oleic acid) that supports favorable substitution for butter, margarine and dairy fat

Dosing & Compounds

Typical Dose
About 15 g (4-5 medium olives) as a typical serving; Mediterranean-diet intakes of olives and olive oil cluster around 20-25 g/day of olive oil equivalent
Active Compounds
Monounsaturated fatty acids (oleic acid)Secoiridoid polyphenols (oleuropein, ligstroside)Simple phenols (hydroxytyrosol, tyrosol)Phenolic acids and flavonoids (luteolin, apigenin, verbascoside)Triterpenes (maslinic acid, oleanolic acid)Vitamin E (alpha-tocopherol)Dietary fiber (insoluble + pectin)Minerals (sodium from brine, iron, calcium, copper)Carotenoids and chlorophylls (in green/ripe pigment fraction)

Safety & Cautions

High sodium is the main concern—brined/canned olives can carry roughly 700-900 mg sodium per 100 g (USDA: ~735 mg/100 g for ripe canned), relevant for hypertension and salt-restricted diets. Olives are calorie- and fat-dense for their size. Rare reports of allergy to olive fruit/pollen exist. Olive-leaf extracts (used in BP studies) may have additive blood-pressure- and glucose-lowering effects with antihypertensive and antidiabetic medications and are not interchangeable with eating olives. Pitted-olive products can still contain pit fragments (dental/choking risk). Acrylamide and, historically, ferrous-gluconate darkening agents are processing considerations in some ripe black olives. Educational only — always check with your doctor or pharmacist before combining Olives with any medicine.

Key Studies

Systematic review & meta-analysis Martinez-Gonzalez 2022 ✓ Full text
Systematic review & meta-analysis (27 studies; ~800,000+ participants): each additional 25 g/day olive oil associated with 16% lower CVD risk (RR 0.84, 95% CI 0.76-0.94), 22% lower type 2 diabetes risk (RR 0.78), and 11% lower all-cause mortality (RR 0.89); no association with cancer
Meta-analysis of cohorts Xia 2022 ✓ Full text
Meta-analysis of prospective cohorts: highest vs lowest olive oil intake associated with 15% lower CVD risk (RR 0.85, 95% CI 0.77-0.93) and 17% lower all-cause mortality (RR 0.83, 95% CI 0.77-0.90), with benefit plateauing near 20 g/day
Systematic review & meta-analysis Razmpoosh 2022 ✓ Full text
Meta-analysis of 12 RCTs (n=819): olive-leaf extract lowered systolic BP by 3.86 mmHg and triglycerides by 9.51 mg/dL overall, with larger lipid and BP reductions in hypertensive subgroups
Randomized controlled trial Lamti 2025 ✓ Full text
Double-blind RCT (n=621 hypertensives): olive-leaf extract reduced 24-h systolic BP by 6.4 mmHg vs baseline (95% CI -10 to -2.1) and improved lipids, glucose, CRP and body weight with no significant adverse events
Randomized controlled trial Estruch 2018 ✓ Full text
PREDIMED RCT (n=7,447, republished after methodological correction): Mediterranean diet supplemented with extra-virgin olive oil reduced major cardiovascular events (HR ~0.69 vs control diet)
Randomized crossover trial Lockyer 2017 ✓ Full text
Crossover RCT in 60 pre-hypertensive men: phenolic-rich olive-leaf extract (~136 mg oleuropein) lowered 24-h systolic BP by 3.3 mmHg, total cholesterol by 0.32 mmol/L, LDL by 0.19 mmol/L and triglycerides by 0.18 mmol/L vs control
Randomized crossover trial Covas 2006 ✓ Full text
EUROLIVE crossover RCT (n=200 men): olive oil HDL cholesterol rose linearly with phenolic content and oxidized LDL markers fell progressively, showing benefit beyond monounsaturated fat alone
Narrative review Katsiki 2021 ✓ Full text
Narrative review summarizing that olive oil monounsaturated fat and phenolic antioxidants improve oxidative stress, endothelial function, blood pressure and lipid/carbohydrate metabolism, supporting CHD/CVD prevention
Prospective cohort Guasch-Ferre 2020 ✓ Full text
In ~93,000 US adults (Nurses' Health Study + Health Professionals Follow-up) over 24 years, >7 g/day olive oil intake was associated with 14% lower total CVD risk (HR 0.86) and 18% lower CHD risk; replacing margarine/butter/mayonnaise/dairy fat with olive oil lowered CVD risk 5-7%
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Olives

What is Olives used for?

Olives is most often taken for Cardiovascular support: olive intake (and olive oil from the same fruit) is associated with lower risk of cardiovascular disease in large prospective cohorts, Improved lipid profile: olive/olive-leaf polyphenols modestly raise HDL and lower triglycerides and oxidized LDL in RCTs, Blood-pressure lowering, shown for olive-leaf extract (oleuropein-rich) in randomized trials, especially in hypertensive adults, Antioxidant activity: hydroxytyrosol and oleuropein reduce LDL oxidative damage in human crossover studies. Brined Mediterranean fruit rich in oleic acid and polyphenols

Does Olives work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. The human evidence for olives sits largely within the broader olive-fruit/olive-oil and Mediterranean-diet literature rather than table olives studied in isolation. Large prospective cohorts and meta-analyses consistently link higher olive oil consumption to lower cardiovascular disease and all-cause mortality (roughly 15-16% lower CVD risk per ~25 g/day, with benefit plateauing near 20 g/day), and the PREDIMED randomized trial showed a Mediterranean diet supplemented with extra-virgin olive oil reduced major cardiovascular events. Randomized crossover trials (e.g., EUROLIVE) demonstrate that the phenolic fraction—hydroxytyrosol and oleuropein—modestly raises HDL and lowers oxidized LDL in a dose-dependent manner, and olive-leaf extract RCTs and meta-analyses show small but real reductions in systolic blood pressure and triglycerides. However, most high-quality trials use olive oil or concentrated olive-leaf extracts, not whole brined table olives, so direct causal evidence for table olives specifically is limited and effect sizes are modest. Table olives also carry a large sodium load from brining that is absent from olive oil, which complicates extrapolation. Overall the evidence is best graded moderate: biologically plausible, supported by consistent observational data and supportive mechanistic RCTs, but with limited whole-fruit-specific trials.

What is the typical dose of Olives?

About 15 g (4-5 medium olives) as a typical serving; Mediterranean-diet intakes of olives and olive oil cluster around 20-25 g/day of olive oil equivalent

Is Olives safe? Any cautions or side effects?

High sodium is the main concern—brined/canned olives can carry roughly 700-900 mg sodium per 100 g (USDA: ~735 mg/100 g for ripe canned), relevant for hypertension and salt-restricted diets. Olives are calorie- and fat-dense for their size. Rare reports of allergy to olive fruit/pollen exist. Olive-leaf extracts (used in BP studies) may have additive blood-pressure- and glucose-lowering effects with antihypertensive and antidiabetic medications and are not interchangeable with eating olives. Pitted-olive products can still contain pit fragments (dental/choking risk). Acrylamide and, historically, ferrous-gluconate darkening agents are processing considerations in some ripe black olives.

How many studies support Olives?

NutriDex cites 9 sources for Olives, graded "Moderate".

Cite this page
APA

Peh, D. (2026). Olives (Olea europaea): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/olives

BibTeX
@misc{nutridex_olives,
  author       = {Peh, Daryl},
  title        = {Olives (Olea europaea): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/olives},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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