What are the benefits of Omega-3 fatty acids for the brain?
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What are essential Omega-3 fatty acids?
Omega-3 fatty acids are polyunsaturated fats in food and also provide calories to give your body energy and have many functions in your heart, blood vessels, lungs, immune system, and endocrine system. There are three main types:
Alpha-linolenic acid (ALA) is found mostly in some green vegetables (such as Brussels sprouts, spinach, and kale), vegetable oils (such as canola or soybean), nuts (such as walnuts), and seeds (such as flaxseeds and pumpkin seeds). The body converts ALA into EPA or DHA, but only a small fraction of it is converted.
Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are found mostly in oily fish, such as mackerel and salmon.
What foods are good sources of essential fatty acids & Omega-3?
Omega-3s are found naturally in some foods and are added to some fortified foods. You can get adequate amounts of Omega-3s by eating a variety of foods.
Linoleic acid is found in many vegetable oils - including flaxseed oil, from which it gets its name. Some seeds and nuts also contain very good amounts of linoleic acid, such as pine nuts, pecans and sunflower seeds.
Alpha-linoleic acid is contained in many seeds and nuts known to be particularly healthy, such as walnuts, chia seeds and flaxseeds. It is also contained in certain vegetable oils such as rapeseed and soybean.
Finally, the main dietary source of EPA and DHA is oily fish. They are also found in some seaweeds and, of course, in dietary supplements made from marine organisms: fish oil, seaweed oil and seaweed oils.
What role do Omega-3s essential fatty acids play in the brain?
The Omega-3 fatty acids EPA and DHA are critical for normal brain function and development throughout all stages of life. They are abundant in the cell membranes of brain cells, preserving cell membrane health and facilitating communication between brain cells. In fact, low levels of DHA can lead to cognitive problems, such as learning and developmental deficits.
DHA is also very important for our vision: the retina contains very high levels of DHA, and studies have shown that low levels of DHA in the early years of life can lead to lifelong visual impairments.
Can Omega-3s prevent or cure mental disorders?
There is a large number of research on the role of Omega-3s in the prevention and treatment of conditions such as depression, dementia, stroke and schizophrenia.
They have a positive effect on brain function: by improving the brain's oxygen and nutrient supply, we also get an increase in cognitive performance. And, of course, preventing the build-up of fatty deposits also helps prevent strokes or other brain conditions related to vascular dysfunction, such as vascular dementia.
Omega-3s (particularly DHA) may slow cognitive decline, but in general, they have not been proven effective in curing or preventing dementia, such as Alzheimer's disease. This lack of evidence in favor of omega-3s is likely due to the many factors associated with dementia, and our incomplete understanding of the brain.
There is more evidence in favor of Omega-3 supplementation for depression. Research published in 2018 found that Omega-3 supplementation can improve symptoms of depression. However, this is only true for fish oil formulations that contain more EPA than DHA, while fish oil containing more DHA than EPA showed no effect. Most fish oil supplements list this type of information in the supplement facts table, so be careful when you buy them!
