The Study
Effects of Walnut Consumption on Blood Lipid Profile and Apolipoproteins in Adults: A GRADE‐Assessed Systematic Review and Dose–Response Meta‐Analysis of 49 Randomized Controlled Trials
This study combines results from many experiments where people were randomly given walnuts or not, and their blood fats were measured. Because it uses real experiments, it can tell us that walnuts likely cause changes in cholesterol, not just that they're linked by chance.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
This study looked at 49 experiments to see if eating walnuts helps make your blood healthier by lowering bad fats.
Where does this study sit?
Systematic Reviews & Meta-analyses
Max 100Randomized Trials
Max 90Cohort Studies
Max 72Case-Control
Max 58Cross-Sectional
Max 44Case Reports & Series
Max 30Expert Opinion
Max 539 / 100
Quality score
The highest quality evidence. These studies systematically search, appraise, and synthesize results from multiple individual studies, providing the most reliable summary of current knowledge.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These drops in bad fats are small but helpful for heart health, especially if you already have high cholesterol or triglycerides.
- 2Walnuts lowered bad cholesterol (LDL) by 5.68 mg/dL, total cholesterol by 6.39 mg/dL, and triglycerides by 6.24 mg/dL.
- 3They didn’t meaningfully raise good cholesterol (HDL) or affect key proteins like Apo-A1 and Apo-B.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Food Science & Nutrition
Year
2026
Authors
G. Mashayekhi, D. Ashtary-Larky, Mehdi Karimi, Omid Asbaghi, Arvin Porkar Rezaeyeh, Zahra Shouhani, Ali Hosseini, M. Naderian
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.