Omega-3 are polyunsaturated fatty acids which are crucial for heart, brain and eye health. But which foods contain the most?
Omega-3 are polyunsaturated fatty acids, ie., fatty acids that contain at least two double bonds between their carbon molecules.
More specifically, omega-3s comprise alpha-linolenic acid (ALA), a short-chain fatty acid, and eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), both of which are long-chain fatty acids.
These are termed ‘essential’ as our bodies are unable to synthesise them in sufficient amounts. We cannot produce ALA, and though ingested ALA can be converted into EPA and DHA, it only produces very small amounts. It is therefore vital to obtain these omega-3 fatty acids from our diet.
Omega-3, often referred to as ‘good fats’, play a very important role in health:
The best animal-source foods for omega-3 are fish (primarily oily fish, followed by some lean fish) and seafood. They contain mainly DHA and EPA:
It’s worth noting that wild fish usually have more omega-3 than farmed fish …
Land animal-source foods contain far fewer omega-3 than oily fish.
The best such sources are:
Eggs and dairy products, ideally enriched with omega-3, can therefore make a modest contribution to an omega-3-rich breakfast.
Let’s now take a look at omega-3-rich foods from plant sources.
First of all, we’re aware that many of our readers would like to know which fruit has the most omega-3… Unfortunately, the majority of fresh fruits have no omega-3 at all, the one exception being avocados which have around 0.1g of ALA per 100g).
In fact, the best plant-source foods for omega-3 (specifically ALA) are seeds (and seed oils), nuts and dried fruits, and to a lesser extent, some green vegetables:
In addition, some types of edible seaweed contain small amounts of EPA and DHA: ulva (sea lettuce), porphyra (nori), Ecklonia cava, Chlorella…
To add to your omega-3 intake, especially EPA and DHA, you also have the option of taking dietary supplements offering higher doses. Standard omega-3 supplements contain fish oil, usually obtained from oily fish in which the omega-3 is in the form of triglycerides or ethyl esters.
Krill oil, on the other hand, is extracted from krill, small shrimp-like crustaceans. Here, the omega-3 are in the form of phospholipids which are more easily absorbed. It also contains astaxanthin and does not smell or taste as strong as fish oil.
Finally, calanus oil comes from Calanus finmarchicus, a tiny zooplankton copepod found in arctic regions. Its omega-3 are primarily in the form of wax esters, which are better able to withstand enzymes in the gut and thus offer additional effects on metabolism. Another key advantage is that as calanus is so abundant, it is considered a renewable resource.
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