The Study
High-Tyrosol/Hydroxytyrosol Extra Virgin Olive Oil Enhances Antioxidant Activity in Elderly Post-Myocardial Infarction Patients
This study gave older people who had a heart attack different kinds of olive oil and checked if their blood got better at fighting damage. It found one kind of oil might help a little, but it didn't test if they lived longer or had fewer heart problems. So we can't say the oil definitely fixes anything — just that it might help a bit.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Older people who had a heart attack drank a spoonful of special olive oil every day for 6 months to see if it helped their blood fight damage.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 547 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means the oil helped repair a key defense system in the blood that’s weakened after a heart attack, even though it didn’t change other markers like inflammation or fat oxidation.
- 2Their blood's antioxidant power (FRAP) went up by 67.7 μM Fe²⁺, and a protective enzyme (PON-1) increased by 3.68 U/mL — but only in heart attack survivors, not in healthy seniors.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Antioxidants
Year
2025
Authors
Mojgan Morvaridzadeh, Mehdi Alami, N. Zoubdane, Hawa Sidibé, H. Berrougui, T. Fülöp, Michel Nguyen, A. Khalil
Related Content
Claims (6)
Regular consumption of extra virgin olive oil is associated with better cardiovascular health and improved liver health due to the presence of polyphenols.
In older adults who previously had a heart attack, drinking high-phenolic extra virgin olive oil for 26 weeks does not change plasma malondialdehyde levels, lecithin-cholesterol acyltransferase activity, or fasting polyphenol concentrations, but it does increase FRAP and PON-1 activity.
In elderly people, high-phenolic extra virgin olive oil increases FRAP and PON-1 antioxidant activity only in those who have had a heart attack, not in those who have not, when both groups consume the same amount and have similar baseline health.
Drinking 25 mL of high-phenolic extra virgin olive oil daily delivers 8 mg of tyrosol and hydroxytyrosol, more than the 5 mg/day recommended for antioxidant benefits, but blood levels of these compounds do not increase after fasting.
Elderly people who have had a heart attack have lower levels of a specific antioxidant enzyme in their blood compared to healthy elderly people, and consuming high-phenolic extra virgin olive oil for 26 weeks increases this enzyme level partially.
In elderly individuals with a prior heart attack, daily consumption of 25 mL of high-phenolic extra virgin olive oil for 26 weeks increases serum antioxidant capacity by 67.7 μM Fe²⁺ and paraoxonase-1 activity by 3.68 U/mL compared to baseline levels.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.