The Benefits of Omega-3 for Heart Health

Introduction

Heart disease remains a leading cause of mortality worldwide, sparking interest in preventative measures and lifestyle modifications that support cardiovascular health. Among the potential solutions, Omega-3 fatty acids have gained prominence for their reputed benefits in reducing heart disease risks. Commonly sourced from fish oil and certain plant oils, Omega-3 fatty acids are believed to offer various advantages, including cholesterol management, improved cardiovascular function, and reduced inflammation. But how substantial are these benefits? Is this perception still valid in 2025? 

We will answer the commonly asked questions: 

• Does Omega-3 reduce cholesterol and triglycerides?
• Does fish oil help with our heart health?
• Does Omega-3 help with our cardiovascular health and offer heart benefits?
• Can Omega-3 supplements help your heart? 

This article explores the evidence supporting the role of Omega-3 in heart health, with a focus on key claims such as Omega-3’s ability to reduce cholesterol and improve overall cardiovascular function. By examining scientific studies, practical applications, and expert perspectives, we aim to uncover the true potential of Omega-3 for heart health.

In addition to this we will also describe a new possible treatment available for high triglycerides, which are apart from LDL, also known as the bad cholesterol. More details below, but in essence it`s called Icosapent Ethyl and can be used in secondary prevention. 

Understanding Omega-3 Fatty Acids

Omega-3 fatty acids are essential fats that the body cannot produce on its own. They are primarily sourced from fatty fish like salmon, mackerel, and sardines, as well as from supplements like fish oil capsules. Fish oil is derived as a byproduct of commercially produced fishmeal, which is made from whole wild-caught fish, bycatch, and fish processing residues to serve as animal feed. In the past, fish oil was considered a waste product of fishmeal production and was often discarded into the ocean or incinerated.

The three main types of Omega-3 fatty acids are:

• ALA (alpha-linolenic acid): Found in plant oils such as flaxseed, chia seeds, and walnuts. We won`t discuss this acid in our article. 
• EPA (eicosapentaenoic acid): Found in fish and fish oil.
• IPE (icosapent ethyl): Highly purified EPA ester. 
• DHA (docosahexaenoic acid): Also sourced from fish and fish oil.

Crude fish oil contains 12% DHA, 70% other and 18% EPA. 

A meta-analysis published in 2021, which included 38 trials and nearly 150 000 patients, showed that Omega-3 fatty acids reduce cardiovascular mortality and improving cardiovascular outcomes. Interestingly however, EPA monotherapy showed superior efficacy over EPA+DHA.

(https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(21)00277-7/fulltext) 

More scientific data below.

Omega-3 Heart Benefits: Scientific Evidence

Does Omega-3 Reduce Cholesterol?

One of the central claims surrounding Omega-3 is its ability to reduce cholesterol levels. In general terms, cholesterol can be `good` or `bad`. `Good cholesterol` is called HDL (high-density lipoprotein) and `bad cholesterol` is called LDL (low-density lipoprotein). However, the third measurable fatty substance are called Triglycerides. Both high LDL levels and high triglycerides levels are associated with a risk of heart disease.

(https://pubmed.ncbi.nlm.nih.gov/26844337/)

(https://www.sciencedirect.com/science/article/pii/S0735109718348174?via%3Dihub)

The answer to this question is that Omega-3 fatty acids, especially EPA reduce Triglycerides levels, however their effects on cholesterol levels, although extensively studied, are still inconclusive. 

Fish Oil Heart Health

Fish oil supplements are a popular source of Omega-3, with many proponents claiming they can prevent heart attacks and strokes. 

The 2021meta-analysis mentioned already, Omega-2 fatty acids were shown to reduce death associated with heart conditions, risk of heart attacks, other coronary artery disease events and need for bypass surgery or stenting procedures.

(https://www.thelancet.com/action/showPdf?pii=S2589-5370%2821%2900277-7) 

The REDUCE-IT trial, published in 2020, demonstrated that Icosapent ethyl in patients with high triglycerides levels, already treated with statins, reduces the need for stenting and bypass surgeries.

(https://pmc.ncbi.nlm.nih.gov/articles/PMC7752247/) 

Icosapent ethyl (IPE) is a highly purified EPA. The mechanism of action in prevention the above events is not entirely clear yet, but a study called EVAPORATE trial, which was published in 2020 shed some light on this interesting phenomenon. This study, which enrolled 80 patients, showed that IPE reduces the volume of furring up of coronary arteries.

(https://pubmed.ncbi.nlm.nih.gov/32860032/) 

Omega-3 Cardiovascular Benefits

So what are the actual recommendations of our British National Institute for Health and Care Excellence (NICE)? 

NICE concluded the below in it`s 2023 guideline:

1.12.5 Do not offer omega 3 fatty acid compounds to prevent CVD. Icosapent ethyl is an exception to this if used as described in NICE’s technology appraisal guidance on icosapent ethyl with statin therapy for reducing the risk of cardiovascular events in people with raised triglycerides. [2014, amended December 2023] 

1.12.6 Tell people that there is no evidence that omega 3 fatty acid compounds help to prevent CVD, except use of icosapent ethyl as described in NICE’s technology appraisal guidance on icosapent ethyl with statin therapy. [2014]

(https://www.nice.org.uk/guidance/ng238/resources/cardiovascular-disease-risk-assessment-and-reduction-including-lipid-modification-pdf-66143902851781)

Therefore in our clinical practice we do not recommend Omega-3 fatty acids as a preventive measure for cardiovascular disease, apart from IPE in patients with high triglycerides as a secondary prevention. Secondary prevention means that someone has already had a heart problem, i.e. a heart attack. 

Dr Bart Olechowski: An Experienced NHS and Private Consultant Cardiologist in Hampshire, UK

Dr Bart is a renowned consultant cardiologist, who offers private practice services in Andover, Basingstoke, Winchester, and London. He specialises in the diagnosis and management of cardiovascular conditions, Dr Bart provides comprehensive care for patients experiencing chest pain, palpitations, blackouts, and breathlessness across Hampshire.

Diagnostic Services Offered by Dr Bart

To support his patients, Dr. Bart arranges the following diagnostic tests:

• Cholesterol/Lipid Profiles: This blood test measures levels of LDL, HDL, and triglycerides to assess cardiovascular risk. Understanding these levels allows Dr Bart to design personalised treatment plans aimed at improving lipid balance and help his patients with their heart health. 
• ECG (Electrocardiogram): A non-invasive test that records the heart’s electrical activity, used to detect arrhythmias and other abnormalities. ECGs are often the first step in evaluating unexplained chest pain or palpitations. This is often done at the same as the first consultation with Dr Bart. 
• Echocardiogram: An ultrasound of the heart that evaluates its structure and function, including valve performance and pumping efficiency. This test is essential for diagnosing heart failure, valvular diseases, and cardiomyopathies. We offer one stop clinics, where Echocardiograms can be performed at the same time as the first consultation. 
• Holter Monitoring: A portable device that records continuous ECG readings over several days (usually 72 hours), helping diagnose intermittent arrhythmias. Holter monitors are particularly useful for patients who experience sporadic symptoms like palpitations or blackouts. Via our clinics these devices are either delivered to patients homes or applied during the first consultation. 
• Coronary Angiograms: An imaging procedure that uses contrast dye and X-rays to visualise blockages in coronary arteries. This test is critical for patients with suspected coronary artery disease and helps determine the need for interventions like stenting or bypass surgery. Dr Bart performs his invasive procedures, which also include coronary stenting at Hampshire Hospitals Heart Centre in Basingstoke. 

Dr Bart’s patient-centred approach ensures tailored treatment plans that integrate the latest advancements in cardiovascular care. Dr Bart is always very happy to discuss any possible preventive measures in his clinics, including the use of Omega-3 fatty acids and their potential heart benefits. 

Other Lifestyle Factors that help to prevent heart disease

While Omega-3 supplementation may not offer heart benefits as it was initially thought. The holistic approach to heart health is what we would recommend. Regular exercise, a balanced diet, smoking cessation, and effective stress management are equally important. The Mediterranean diet, rich in fatty fish, tomatoes, nuts, and olive oil, is an excellent example of a heart-healthy eating pattern that naturally incorporates all necessary ingredients. 

Physical activity plays a complementary role by improving cardiovascular fitness, reducing blood pressure, and aiding in weight management. Similarly, stress management techniques such as mindfulness, yoga, and deep breathing exercises can mitigate the adverse effects of chronic stress on heart health.

More about the Heart-Healthy foods in our previous blog post –

https://drbart.co.uk/top-heart-healthy-foods-and-how-to-incorporate-them-into-your-diet/. 

Equally more about the role of exercise in improving heart health can be found here –

https://drbart.co.uk/the-role-of-exercise-in-cardiovascular-health-how-much-is-enough/. 

Conclusion

The evidence supporting Omega-3 for heart health is not as convincing as initially thought, though not without promise, especially in a form of Icosapent Ethyl.  Improving cardiovascular wellness appears to be mediated by reduction in triglycerides levels, which indeed are a risk factor for heart disease. However, the magnitude of these benefits can vary based on individual factors such as baseline risk and underlying past medical history. 

For individuals considering Omega-3 supplements, consulting a healthcare provider is essential to ensure appropriate use. Professionals like Dr Bart, with expertise in advanced diagnostic tests and personalised care, can guide patients toward optimal heart health. Ultimately, there are several valuable tools that can help in the fight against cardiovascular disease. The broader lifestyle changes and medical care is something that we would recommend. 

Future Perspectives

Research into Omega-3 fatty acids continues to evolve, with new studies exploring their potential in areas such as arrhythmia prevention, heart failure management, and post-cardiac event recovery. As our understanding grows, Omega-3 may play a greater role in personalised medicine and cardiovascular health strategies. However, for now as per NICE recommendations Omega-3 fatty acids would not be recommended in prevention of heart disease.