Supplements · Metabolic & Cardiometabolic

olive oil improves blood cholesterol

In plain terms: Does olive oil improve your cholesterol?

Contested Supplements 🔬 Includes disconfirming

RefutedContestedStrong support

consensus score 0.13

Not in the way people assume. Its real benefit is on cholesterol *quality* - the polyphenols in good olive oil raise HDL and reduce LDL oxidation. But on the standard cholesterol numbers (LDL, total), pooled trials show little or no change, and one recent study even saw LDL rise slightly. It's about oxidation and phenolics, not your lipid panel.

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)

MechanismIn-vitroAnimalObservationalRCTMeta-analysis

How the studies fall

5 support 3 contradict 0 tested null 3 mixed · 11 sources, 8 independent groups

What the evidence shows

This is olive oil's most genuinely **contested** claim. The landmark EUROLIVE trial showed that the *phenolic content* of olive oil dose-dependently raised HDL and lowered oxidized LDL — a real, quality-of-lipid benefit. But when you pool all the trials on the standard lipid panel (LDL, HDL, total cholesterol, triglycerides), the effect is **trivial or null**, some comparison oils (canola, safflow

The evidence (11)

Source	Grade	Stance	Quality	Finding
Jabbarzadeh-Ganjeh B et al. 2022 · Crit Rev Food Sci Nutr	meta-analysis	contradicts	high	Dose-response meta 34 RCTs: per 10 g/d olive oil trivial low-certainty effects on TC/LDL/HDL/TG; largely null.
Morris C et al. 2026 · Nutrients	RCT	contradicts	low	RCT (27): 40 g/d EVOO increased LDL cholesterol (+5.1 mg/dL, p=0.047) vs control oil in healthy women.
Covas MI et al. 2006 · Ann Intern Med	RCT	supports	high	EUROLIVE crossover RCT (200): dose-dependent rise in HDL and fall in oxidized LDL with olive-oil phenolic content (landmark).
Schwingshackl L et al. 2019 · Nutrients	meta-analysis	supports	moderate	Network meta 13 RCTs: high-phenolic EVOO lowered LDL-C (-0.14 mmol/L) and oxLDL vs refined oil.
Rees K et al. 2019 · Cochrane Database Syst Rev	meta-analysis	mixed	high	Cochrane: MedDiet+EVOO small TC reduction; little/no effect on LDL/HDL/TG (whole-Med).
George ES et al. 2019 · Ageing Res Rev	meta-analysis	supports	moderate	SR+meta 26 studies: high-vs-low-polyphenol olive oil lowered oxLDL, raised HDL +2.4 mg/dL, lowered TC.
Amiri M et al. 2020 · Crit Rev Food Sci Nutr	meta-analysis	mixed	moderate	Meta: canola oil superior to olive oil for TC/LDL reduction head-to-head, implying olive oil's own lipid effect is modest.
Schwingshackl L et al. 2018 · Nutrients	meta-analysis	mixed	high	Network meta 54 trials: olive oil better than butter for LDL but ranked behind safflower/rapeseed.
Morvaridzadeh M et al. 2023 · Pharmacol Res	meta-analysis	contradicts	high	Meta 33 RCTs: EVOO no significant effect on TC/LDL/HDL/TG/ApoB/Lp(a).
Hohmann CD et al. 2015 · Phytomedicine	meta-analysis	supports	moderate	Meta 8 crossover RCTs: high-phenolic olive oil lowered oxLDL (SMD -0.25); no HDL/LDL/TC/TG change.
Frumuzachi O et al. 2025 · Nutrients	meta-analysis	supports	moderate	Meta 14 studies: olive-oil phenolics lowered total cholesterol (SMD -0.19) and triglycerides (SMD -0.32).

Disagree, or know a study we missed?

We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.

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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.