Will fish oil lower cholesterol

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The Impact of Fish Oil on Cholesterol Levels: A Comprehensive Review

Introduction to Fish Oil and Cholesterol

Fish oil, rich in omega-3 fatty acids, is widely recognized for its cardiovascular benefits, particularly in reducing triglyceride levels. However, its effects on cholesterol levels, including total cholesterol, LDL (low-density lipoprotein), and HDL (high-density lipoprotein), are less clear and have been the subject of numerous studies.

Fish Oil and Total Cholesterol

Several studies have investigated the impact of fish oil on total cholesterol levels with mixed results. A randomized clinical trial involving patients with nonalcoholic fatty liver disease (NAFLD) and hyperlipidemia found that fish oil significantly decreased total cholesterol levels . Similarly, a study on the effects of MaxEPA oil showed a reduction in total cholesterol when participants switched from their habitual diet to a fish oil-rich diet . However, a systematic review and meta-analysis concluded that fish oil supplementation did not significantly change total cholesterol levels in hyperlipidemic subjects .

Fish Oil and LDL Cholesterol

The effect of fish oil on LDL cholesterol is complex. Some studies report an increase in LDL cholesterol levels with fish oil supplementation. For instance, a placebo-controlled trial found that fish oil raised LDL cholesterol levels in hypertriglyceridemic patients . Another study observed a significant increase in LDL cholesterol in men with hypercholesterolemia after fish oil supplementation . Conversely, a study on saury oil, a fish oil high in omega-11 monounsaturated fatty acids, showed a reduction in LDL particle counts .

Fish Oil and HDL Cholesterol

The impact of fish oil on HDL cholesterol is generally positive but modest. A study involving men at risk of heart disease found that fish oil increased HDL cholesterol levels when combined with a high-fat diet . Additionally, a systematic review noted slight increases in HDL cholesterol with fish oil supplementation . However, the changes are often not substantial enough to be clinically significant.

Fish Oil and Triglycerides

Fish oil is consistently effective in lowering triglyceride levels. Multiple studies, including a systematic review and meta-analysis, have confirmed that fish oil significantly reduces fasting blood triglyceride levels Eslick2009Ågren1996. This effect is dose-dependent and correlates with the intake of EPA and DHA, the primary omega-3 fatty acids in fish oil.

Conclusion

Fish oil supplementation has a well-documented effect on lowering triglyceride levels, which is beneficial for cardiovascular health. However, its impact on cholesterol levels is more variable. While some studies show reductions in total cholesterol and LDL particle counts, others report increases in LDL cholesterol. The effect on HDL cholesterol is generally positive but modest. Therefore, while fish oil can be a valuable supplement for managing triglycerides, its effects on cholesterol require careful consideration and further research.

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Most relevant research papers on this topic

Fish Oil Supplements Lower Serum Lipids and Glucose in Correlation with a Reduction in Plasma Fibroblast Growth Factor 21 and Prostaglandin E2 in Nonalcoholic Fatty Liver Disease Associated with Hyperlipidemia: A Randomized Clinical Trial

Fish oil supplements can improve metabolic abnormalities in nonalcoholic fatty liver disease associated with hyperlipidemia by reducing fibroblast growth factor 21 and prostaglandin E2.

RCTRigorous JournalHighly Cited

2015·

96citations

·Yu Qin et al.

PLoS ONE·

DOI

Fish oil attenuates the cholesterol induced rise in lipoprotein cholesterol.

Fish oil rich in n-3 fatty acids can lower lipoprotein cholesterol even when the intake of cholesterol is high, even when triglyceride levels are high.

Non-RCTHighly Cited

1986·

128citations

·P. Nestel

The American journal of clinical nutrition·

DOI

Effects of a low saturated fat, low cholesterol fish oil supplement in hypertriglyceridemic patients. A placebo-controlled trial.

Fish oil supplements can lower plasma triglyceride levels in hypertriglyceridemic patients, but monitoring of lipoprotein changes is necessary due to potential long-term benefits.

RCTHighly Cited

1988·

94citations

·William S. Harris et al.

Annals of internal medicine·

DOI

Effects of diets containing fish oils or fish oil concentrates with high cetoleic acid content on the circulating cholesterol concentration in rodents. A systematic review and meta-analysis

Intake of cetoleic acid-rich fish oils and concentrates significantly lowers circulating total cholesterol concentration in rodents, suggesting potential as functional dietary ingredients or supplements to reduce the risk of developing cardiovascular disease in humans.

Meta-Analysis

2023·

4citations

·M. Mjaatveit et al.

The British Journal of Nutrition·

DOI

Benefits of fish oil supplementation in hyperlipidemia: a systematic review and meta-analysis.

Fish oil supplementation significantly reduces fasting blood triglyceride levels in hyperlipidemic individuals, but does not significantly affect total, HDL, or LDL cholesterol levels.

Meta-AnalysisHighly Cited

2009·

298citations

·G. Eslick et al.

International journal of cardiology·

DOI

Fish oil supplementation does not lower plasma cholesterol in men with hypercholesterolemia. Results of a randomized, placebo-controlled crossover study.

Fish oil supplements do not lower plasma cholesterol levels in middle-aged men with hypercholesterolemia without elevated triglycerides, and should not be recommended as a method to lower cholesterol in these patients.

RCT

1989·

39citations

·T. Wilt et al.

Annals of internal medicine·

DOI

Effects of varying dietary fat, fish, and fish oils on blood lipids in a randomized controlled trial in men at risk of heart disease.

Fish or fish oil with a 40%-fat diet improves blood lipids, while a 30%-fat diet reverses negative effects of omega-3 fats on cholesterol.

RCTHighly Cited

1994·

89citations

·Trevor A. Mori et al.

The American journal of clinical nutrition·

DOI

Supplementation with saury oil, a fish oil high in omega-11 monounsaturated fatty acids, improves plasma lipids in healthy subjects.

Saury oil supplementation is well-tolerated and improves cardiovascular parameters like LDL particle counts, HDL particle size, and plasma TG levels in healthy individuals.

RCT

2019·

18citations

·Zhi-Hong Yang et al.

Journal of clinical lipidology·

DOI

Fish diet, fish oil and docosahexaenoic acid rich oil lower fasting and postprandial plasma lipid levels.

Moderate intakes of long-chain n-3 fatty acids from a fish diet, fish oil, and pure DHA can decrease fasting and postprandial triglyceride levels in healthy male students.

RCTHighly Cited

1996·

131citations

·J. Ågren et al.

European journal of clinical nutrition

Fish oils and plasma lipid and lipoprotein metabolism in humans: a critical review.

Fish oil supplements rich in omega-3 fatty acids can lower triglyceride levels but have little effect on total cholesterol levels, with potential alternative sources like fatty fish and linolenic acid.

Literature ReviewHighly Cited

1989·

1153citations

·W. S. Harris

Journal of lipid research

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