Metabolic & Cardiometabolic
oxidized linoleic-acid metabolites (OxLAMs, e.g. 9-/13-HODE) causes atherosclerosis
In plain terms: Do the oxidized fats from seed oils clog your arteries?
Part of: 🔍 seed oils
OxLAMs are present in plaque and have some pro-atherogenic actions, but several are also anti-inflammatory and dietary linoleic acid is linked to LOWER heart-disease risk, so the simple "seed-oil OxLAMs cause atherosclerosis" story is not supported.
📅 Last reviewed: 2026-07-14 ⓘ
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)
How the studies fall
The evidence (16)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Han 2000 · J Clin Invest | in-vitro | supports | moderate | OxLDL-derived 9-/13-HODE activate PPARgamma, lower monocyte CCR2, may retain monocytes in lesion — a plausible pro-atherogenic mechanism. |
| Farvid 2014 · Circulation | meta-analysis | contradicts | high | Meta-analysis of prospective cohorts found higher dietary linoleic acid intake associated with a 15% lower coronary heart disease risk, contradicting the artery-clogging claim. |
| Nielsen 2021 · Eur J Nutr | observational | contradicts | moderate | Adipose linoleic acid (long-term intake biomarker) not positively associated with myocardial infarction in Danish case-cohort. |
| Chiang KM 2022 · Metabolites | observational | mixed | moderate | Nested case-control study (77 CAD cases, 148 controls) found 13-oxo-ODE (an OXLAM) was positively associated with incident CAD risk (OR=5.02, 95%CI 0.85-15.6), while other non-LA-derived oxylipins (PGE2/PGD2, 15-deoxy-PGJ2, 5-HETE) were protective. |
| Berkowitz L 2025 · Front Nutr | observational | mixed | moderate | Review of LA and cardiometabolic health concludes that overall human evidence supports beneficial associations between LA exposure and cardiometabolic outcomes, despite hypotheses of pro-inflammatory/oxidative harm. Frames the pro-oxidative/OXLAM-med |
| Veno 2018 · J Am Heart Assoc | observational | contradicts | moderate | Higher adipose linoleic acid associated with LOWER risk of ischemic stroke; no signal that dietary LA loads arteries with harm. |
| Ren 2023 · Crit Rev Food Sci Nutr | meta-analysis | contradicts | high | Meta-analysis of 32 studies found higher blood linoleic acid associated with LOWER coronary heart disease and fatal-CHD risk, opposing the net dietary-seed-oil harm claim. |
| Tricò D 2019 · Antioxid Redox Signal | observational | supports | moderate | In 122 obese adolescents, those with metabolic syndrome (n=50) had higher 9- and 13-oxo-ODE than those without (n=72), and both metabolites were associated with an adverse/proatherogenic lipoprotein profile (elevated small-dense LDL, p<0.005; large V |
| Wang 2018 · Prostaglandins Leukot Essent Fatty Acids | observational | mixed | high | Epidemiology: higher dietary n-6/linoleic acid intake associated with LOWER CVD risk, opposite to a net-atherogenic OxLAM effect. |
| Ochin 2022 · J Lipid Atheroscler | animal | tested-null | low | Dietary oxidized linoleic acid altered hepatic and plasma long-chain fatty-acid distribution in mice, consistent with but not proving a plaque-promoting effect. |
| Bojic 2016 · Anal Bioanal Chem | animal | mixed | moderate | In hypercholesterolemic rabbit plaque, 9-/13-HODE among most abundant oxylipins; biomarkers of lesions, not shown to cause them. |
| Wittwer 2007 · Prostaglandins Leukot Essent Fatty Acids | mechanism | mixed | moderate | 15-LOX/HODE pathway is \"janus-faced\": pro-atherogenic LDL oxidation vs anti-inflammatory 13-HODE inhibiting leukocyte adhesion. |
| Ramsden 2013 · BMJ | RCT | mixed | low | Recovered Sydney-Diet-Heart RCT + meta-analysis: substituting LA-rich oils did not reduce (and may raise) CHD death — but no atherosclerosis-promotion mechanism confirmed. |
| Fu 2002 · Mol Cell Biochem | mechanism | supports | low | 9-HODE and 13-HODE from oxLDL induce ALBP/aP2 in THP-1 macrophages, accelerating cholesterol-ester accumulation in foam cells found in human plaques. |
| DiNicolantonio JJ 2018 · Open Heart | observational | supports | low | Opinion/perspective piece asserting seed-oil LA intake contributes to inflammation, oxidative stress, endothelial dysfunction and atherosclerosis; states OXLAMs activate NF-kB and increase proinflammatory cytokines/adhesion molecules 'paramount in th |
| Nagy 1998 · Cell | mechanism | supports | moderate | Oxidized-LDL components 9-HODE and 13-HODE act as PPARgamma ligands driving macrophage foam-cell gene expression central to atherogenesis. |
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