Theme: iWiki Log in Register

Diff: Omega-3 fatty acids

Comparing revision #2 (2024-01-31 23:44:40) with revision #3 (2026-06-22 13:56:13).

Old	New
'''Omega-3 fatty acids''' are a group of essential polyunsaturated fats that play a crucial role in maintaining the health and functionality of the human body. These fatty acids are classified as "essential" because the body cannot produce them on its own, and they must be obtained through dietary sources. Omega-3 fatty acids are renowned for their numerous health benefits, particularly in supporting cardiovascular health, brain function, and reducing inflammation.
==Types of Omega-3 Fatty Acids==
There are three main types of omega-3 fatty acids, each with distinct properties and dietary sources:

=== Alpha-Linolenic Acid (ALA): ===
ALA is a plant-based omega-3 fatty acid.

Common dietary sources include flaxseeds, chia seeds, walnuts, and canola oil.

The human body can convert a small amount of ALA into the more active forms, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).
	'''Omega-3 fatty acids''' are a group of polyunsaturated fats used by the body in cell membranes, signalling pathways, brain and eye development, inflammation control, and cardiovascular function. The main omega-3 fatty acids discussed in nutrition are alpha-linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid.

=== Eicosapentaenoic Acid (EPA): ===
EPA is primarily found in marine sources.
	The body cannot make alpha-linolenic acid, so it must come from food. It can convert a small amount of alpha-linolenic acid into eicosapentaenoic acid and then docosahexaenoic acid, but the conversion is limited. For that reason, marine sources of eicosapentaenoic acid and docosahexaenoic acid are treated separately from plant sources of alpha-linolenic acid.

Fatty fish, such as salmon, mackerel, and sardines, are rich sources of EPA.
	== Types ==
	* '''Alpha-linolenic acid''', usually shortened to ALA, is found mainly in plant foods such as flaxseed, chia seed, walnuts, rapeseed oil, and soya.
	* '''Eicosapentaenoic acid''', usually shortened to EPA, is found mainly in oily fish, seafood, fish oil, krill oil, and some algal products.
	* '''Docosahexaenoic acid''', usually shortened to DHA, is found mainly in oily fish, seafood, fish oil, and algal oil. It is an important structural fat in the brain and retina.

EPA is known for its anti-inflammatory properties.
	== Dietary Sources ==
	Oily fish is the richest common dietary source of EPA and DHA. Examples include salmon, sardines, mackerel, herring, trout, anchovies, and pilchards. Fresh, frozen, and tinned oily fish can all contribute, although salted and brined products may add a lot of salt.

=== Docosahexaenoic Acid (DHA): ===
DHA is also found in marine sources, particularly in fatty fish and seafood.
	Plant sources provide ALA rather than EPA and DHA. Useful plant sources include:

It is a major structural component of the brain and is essential for cognitive function.
	* Flaxseed and flaxseed oil.
	* Chia seeds.
	* Walnuts.
	* Rapeseed oil.
	* Soya beans and soya oil.
	* Some omega-3 enriched eggs or fortified foods.

DHA is crucial during pregnancy and early childhood for the development of the nervous system.
==Health Benefits==
	Algal oil can provide DHA and sometimes EPA without fish, which makes it relevant for vegan diets.

=== Cardiovascular Health: ===
Heart Disease Prevention: Omega-3 fatty acids have been shown to reduce the risk of heart disease by lowering blood pressure, triglyceride levels, and improving overall cardiovascular health.
	== Health Roles ==
	Omega-3 fats are part of normal nutrition. They are involved in:

Anti-Inflammatory Effects: EPA and DHA help reduce inflammation in the blood vessels, promoting better heart health.
	* Cell membrane structure.
	* Heart and blood vessel function.
	* Brain and eye development.
	* Regulation of inflammatory signalling.
	* Production of signalling molecules derived from fatty acids.

=== Cognitive Function: ===
Brain Development: DHA is a key component of the brain, and adequate intake is crucial during pregnancy and early childhood for proper brain development.
	The strongest public health guidance is food-based. NHS guidance recommends at least two portions of fish a week, including one portion of oily fish. This advice is about overall diet rather than using fish as a medicine.

Cognitive Decline: Omega-3 fatty acids may play a role in reducing the risk of age-related cognitive decline and neurodegenerative diseases.
	== Supplements ==
	Omega-3 supplements include fish oil, cod liver oil, krill oil, and algal oil. They vary widely in EPA and DHA content. A capsule labelled as fish oil does not necessarily contain a high dose of EPA or DHA.

=== Joint Health: ===
Rheumatoid Arthritis: Omega-3 fatty acids have anti-inflammatory properties that may benefit individuals with rheumatoid arthritis by reducing joint pain and stiffness.
	Supplements are not the same as eating fish. Fish provides protein, vitamin D, iodine, selenium, and other nutrients as well as omega-3 fats. Cod liver oil also contains vitamin A and vitamin D, which matters because too much vitamin A can be harmful, especially during pregnancy.

=== Mental Health: ===
Depression and Anxiety: Some studies suggest that omega-3 fatty acids, particularly EPA, may have positive effects on mood and mental health, potentially alleviating symptoms of depression and anxiety.
	Prescription omega-3 products are used in some settings for very high triglycerides, but that is different from general food supplements. Evidence for ordinary over-the-counter fish oil supplements is mixed and depends on dose, population, and outcome studied.

=== Eye Health: ===
Macular Degeneration: DHA is a component of the retina, and a sufficient intake of omega-3 fatty acids may help reduce the risk of age-related macular degeneration.
==Dietary Sources==
Fatty Fish: Salmon, mackerel, sardines, trout, and herring are excellent sources of EPA and DHA.
	== Safety ==
	Food sources of omega-3 fats are suitable for most people as part of a balanced diet. There are limits for some fish because of mercury or pollutants. NHS guidance gives particular limits for shark, swordfish, marlin, tuna, and oily fish during pregnancy or when trying to become pregnant.

Flaxseeds: These tiny seeds are rich in ALA, a plant-based omega-3 fatty acid.
	High-dose omega-3 supplements can interact with anticoagulant or antiplatelet medicines and may not be suitable for everyone. They can also cause indigestion, fishy aftertaste, nausea, or loose stools. Product quality varies, so the amount of EPA and DHA should be checked rather than relying on the size of the capsule.

Chia Seeds: Another plant-based source of ALA.
	== See Also ==
	* [[Pharmacology]]
	* [[Vitamin_C]]
	* [[Macronutrient]]

Walnuts: Walnuts are a good source of ALA and can be easily incorporated into various dishes.
	== References ==
	* [https://ods.od.nih.gov/factsheets/Omega3FattyAcids-Consumer/ NIH Office of Dietary Supplements: Omega-3 consumer fact sheet]
	* [https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/ NIH Office of Dietary Supplements: Omega-3 health professional fact sheet]
	* [https://www.nhs.uk/live-well/eat-well/food-types/fish-and-shellfish-nutrition/ NHS: Fish and shellfish]
	* [https://www.nhs.uk/live-well/eat-well/food-types/different-fats-nutrition/ NHS: Facts about fat]
	* [https://www.bhf.org.uk/informationsupport/heart-matters-magazine/nutrition/omega-3s-and-your-heart British Heart Foundation: Omega-3 foods and your heart]
	* [https://www.bda.uk.com/resource/omega-3.html British Dietetic Association: Omega-3]

Canola Oil: Canola oil contains ALA and is a suitable option for cooking and salad dressings.
==Recommended Intake==
The American Heart Association recommends consuming at least two servings of fatty fish per week to meet omega-3 fatty acid needs. For those who do not regularly consume fish, omega-3 supplements may be considered, but it's essential to consult with a healthcare provider before starting any supplementation.
==Potential Risks and Precautions==
While omega-3 fatty acids are generally safe and beneficial, excessive intake, especially through supplements, can have potential risks, including bleeding issues and interactions with certain medications. Individuals with allergies, fish sensitivities, or specific health conditions should consult with a healthcare professional before making significant changes to their omega-3 intake.
	[[Category:Nutrition]]
	[[Category:Biochemistry]]