The Study
Differential effects of high dose omega-3 fatty acids on metabolism and inflammation in patients with obesity: eicosapentaenoic and docosahexaenoic acid supplementation
This study watched what happened when women took a lot of fish oil pills for three months. It saw that some health markers got better while they were taking them, but then went back to normal after stopping. But because we don’t know if they were randomly assigned and no one was blinded, we can’t say the fish oil definitely caused the changes — it might just be a coincidence.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists gave obese women very high doses of fish oil for 3 months to see if it helped their blood sugar and inflammation, even if they didn’t lose weight.
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 543 / 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.
- 1Yes — even without losing weight, these women’s bodies became better at handling sugar, and their immune cells stayed calmer longer, which could help prevent diabetes.
- 2After 3 months, insulin and insulin resistance dropped by a significant amount and stayed low for 1 month after stopping.
- 3Inflammation genes in immune cells stayed down, but blood TNF-α and fatty acid balance returned to normal.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in Nutrition
Year
2023
Authors
Angélica I. Borja-Magno, M. Guevara-Cruz, A. Flores-López, S. Carrillo-Domínguez, J. Granados, C. Arias, Mary Perry, B. Sears, H. Bourges, F. E. Gomez
Related Content
Claims (6)
Eating more fish oil fats called EPA and DHA may help lower inflammation in your body and brain.
Taking a specific type of fish oil daily for three months may help lower insulin levels in obese Mexican women between 25 and 45, and the benefit might last even after they stop taking it — without needing to lose weight.
Taking a high dose of fish oil daily for three months may calm down certain immune cells in overweight women, and this calming effect can last for at least a month after they stop taking it.
When obese women take a high dose of omega-3 fish oil supplements, their blood levels of a certain inflammation marker drop while they're taking it, but go back up after they stop. However, their cells still keep the gene for that marker turned down, which means the body is handling the marker in two different ways.
Taking a high dose of omega-3 fish oil every day for three months doesn't make obese women lose weight or change their muscle or fat levels — but their metabolism and inflammation might still get better anyway.
Taking a high dose of fish oil daily for three months may help shift the balance of fats in the body of obese women toward less inflammation, but if they stop taking it, that benefit goes away within a month.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.