A Beginner’s Guide to Omega-3 Fatty Acids

Whether you’re trying to eat healthier, exercise smarter, or simply understand how nutrition supports your wellbeing, omega-3 fatty acids are a great place to start. 

You’ve probably heard the term thrown around in health magazines, on supplement labels, or by your trainer. But what are omega-3 fatty acids, exactly? And more importantly, what do omega-3 fatty acids do for your body?

Let’s break it down.

What are Omega-3 fatty acids?

Omega-3 fatty acids are a type of polyunsaturated fat, often called “healthy fats”. These fats are essential to your body’s function, but here’s the kicker: your body can’t make them on its own. That means you have to get them through food or supplements.

There are three main types of omega-3s you need to know about: ALA, EPA, and DHA. If you’ve ever asked, “What is omega-3?” then this blog is for you. 

Types of Omega-3 fatty acid

ALA: The plant-based omega-3

ALA (alpha-linolenic acid) is found in plant sources like flaxseeds, chia seeds, and walnuts. It’s an important form of omega-3, especially if you’re following a vegetarian or vegan diet. However, there’s a catch: ALA must be converted into EPA and DHA, the two forms your body can use, and only about 10% of it makes it through that process.

This is why people on plant-based diets should consider a supplement like algae oil to ensure they’re getting usable omega-3 fatty acids.

EPA: The inflammation fighter 

EPA (eicosapentaenoic acid) is mostly found in oily fish like salmon, sardines, and mackerel. It’s deeply involved in your body’s inflammatory response and helps support cardiovascular and immune health. Many of the benefits of omega-3s, such as reduced inflammation and heart protection, can be traced to EPA.

DHA: Brain and vision support

DHA (docosahexaenoic acid) is another marine-based omega-3, and it’s vital for brain, nervous system, and eye health. It plays a key role in cognitive function, memory, and even mood regulation. DHA is the most abundant omega-3 fatty acid in the brain, making it essential for mental clarity and focus.

Why are omega-3s so important?

Omega-3 fatty acids impact nearly every system in the body, offering a wide range of health benefits. They help reduce inflammation, support cardiovascular health, boost brain function, improve mental wellbeing, and promote strong joints and vision. So, if you’ve ever wondered, “Is omega-3 good for you”? The answer is a firm yes.

5 key omega-3 benefits

Reduce inflammation

Chronic inflammation is a significant factor in many modern diseases, and omega-3 fatty acids help alleviate it. EPA and DHA generate compounds called resolvins and protectins, which tell the body when it’s time to “switch off” inflammation.

Omega-3s also balance out omega-6 fatty acids, another type of polyunsaturated fat. While both are essential, omega-6s tend to promote inflammation, especially when consumed in high amounts (as found in vegetable oils and processed foods). The interaction between fatty acids is complex, but maintaining a healthy omega-3 to omega-6 ratio may help to reduce the risk of many conditions, including heart disease, autoimmune conditions, and joint problems.

Support heart health 

Can omega-3 lower cholesterol? Research suggests that EPA and DHA can reduce triglyceride levels, slightly lower blood pressure, and even stabilise heart rhythms. They also support healthy blood vessels and may modestly increase HDL (the “good” cholesterol). That’s why many doctors recommend omega-3 supplements or regular intake of oily fish as part of a heart-healthy plan.

Enhance brain function

Your brain is nearly 60% fat, and DHA is a major component of that. DHA and other essential fatty acids help keep brain cell membranes fluid and aid neurotransmission, which is how brain cells communicate.

Studies show that omega-3 fatty acids support cognition, improving memory, reducing mental fatigue, and supporting focus. They’re especially important during childhood brain development and may protect against cognitive decline later in life.

Support eye and bone health

DHA is highly concentrated in the retina and supports both visual development in children and long-term eye health in adults. At the same time, omega-3s help reduce joint stiffness and inflammation, making them a powerful ally for people with arthritis, as well as those recovering from intense exercise.

Improve mental health

Does omega-3 help with depression or anxiety? There’s growing evidence that omega-3 fatty acids, especially EPA, may support mood regulation by influencing neurotransmitters like dopamine and serotonin. Low omega-3 intake has been linked to higher rates of depression, anxiety, and even ADHD. Adding omega-3 fatty acids to your routine may offer a natural way to support mental well-being.

How to add omega-3s to your diet: Foods high in omega-3

Adding omega-3 to your diet may be easier than you think. While oily fish is a popular source of omega-3, there are plenty of plant-based options and supplements available as well. 

If you’re wondering what foods contain omega-3, the lists below are a good place to start. 

Marine sources of omega-3 (EPA + DHA)

• Salmon
• Mackerel
• Sardines
• Anchovies
• Herring
• Cod liver oil
• Algae oil (for vegans and vegetarians)

Plant-based sources of omega-3 (ALA)

• Flaxseeds
• Chia seeds
• Walnuts
• Hemp seeds
• Edamame
• Brussels sprouts

If you’re aiming to eat more foods high in omega-3, start by incorporating oily fish into your diet 2–3 times per week. Plant-based? Then boost your intake of ALA-rich seeds and nuts, and consider a daily algae oil supplement for DHA and EPA.

Can you have too much omega-3?

While omega-3 fatty acids are essential to overall health, it is possible to encounter side effects, particularly with over-supplementation. Consuming too high a dose of omega-3 supplements, such as fish oil, can result in uncomfortable side effects like acid reflux, diarrhoea, headaches, and more. 

The European Food Safety Authority recommends an upper limit of 5,000mg per day for all omega-3 fatty acid types combined. As with any supplement, consult a health professional if you experience any adverse effects. 

Does omega-3 help with weight loss?

While omega-3s won’t replace diet and exercise, they can support weight loss in several indirect ways.

They help reduce inflammation, improve insulin sensitivity, and even support lean muscle mass recovery after exercise. Some research suggests omega-3s may also help reduce appetite and improve mood, which can positively impact eating behaviour.

Final thoughts: Why omega-3 fatty acids matter

To sum it up: Omega-3 fatty acids are essential for health, and the modern diet often falls short. Whether you’re focused on fitness, performance, heart health, or mental clarity, omega-3s can make a real difference to your nutrition and overall health. 

Ready to optimise your health?

At My Vital Metrics, we use data-driven tools to help you understand your health on a deeper level,  from body composition to inflammation markers and beyond. Whether you want to improve your diet, enhance recovery, or track long-term health goals, we’re here to help.

You can book a full blood panel with us to assess inflammatory markers, or book a cholesterol test to make sure your triglycerides are in check.