Polyunsaturated fatty acids dietary sources

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Major Types of Polyunsaturated Fatty Acids (PUFAs) and Their Dietary Sources

Polyunsaturated fatty acids (PUFAs) are essential nutrients, mainly classified as omega-3 (n-3) and omega-6 (n-6) fatty acids. The most important omega-3 PUFAs include alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). For omega-6, linoleic acid (LA) and arachidonic acid (AA) are key representatives. These fatty acids must be obtained from the diet because the human body cannot synthesize them efficiently Saini2021Redruello-Requejo2023Kapoor2021+7 MORE.

Plant-Based Sources of Polyunsaturated Fatty Acids

Omega-3 PUFAs from Plants

Plant sources are especially rich in ALA, a precursor to EPA and DHA. Key plant-based sources include:

Chia seeds, flaxseeds, and garden cress seeds: These are among the richest sources of ALA Saini2021Kapoor2021Abedi2014+5 MORE.
Echium plantagineum, Buglossoides arvensis, and Ribes species: These provide stearidonic acid (SDA), which is more efficiently converted to EPA and DHA than ALA Saini2021Rizzo2023.
Oils and fats: Many vegetable oils, such as canola and soybean oil, are good sources of ALA, especially when genetically modified to enhance their PUFA content Redruello-Requejo2023Whelan2006.

Omega-6 PUFAs from Plants

Linoleic acid (LA) is abundant in many vegetable oils, such as sunflower, safflower, corn, and soybean oils Redruello-Requejo2023Kapoor2021Abedi2014+4 MORE.
Nuts and seeds: These are also significant sources of omega-6 PUFAs Kapoor2021Mititelu2024.

Marine and Microbial Sources of Long-Chain PUFAs

Fish and Seafood

Fish and shellfish: These are the primary dietary sources of EPA and DHA, the long-chain omega-3 PUFAs directly linked to health benefits Redruello-Requejo2023Kapoor2021Abedi2014+6 MORE.
Fish oil supplements: Widely used to increase intake of EPA and DHA, especially in populations with low fish consumption .

Algae and Microorganisms

Microalgae and thraustochytrids: These are direct sources of EPA and DHA and are used for vegan and vegetarian supplements Saini2021Rizzo2023Whelan2006+1 MORE.
Genetically modified plants and oil crops: Advances in biotechnology have enabled the production of oils rich in long-chain omega-3 PUFAs from terrestrial sources Rizzo2023Whelan2006Harwood2023.

Animal-Based Sources

Meat, eggs, and dairy: These provide some long-chain PUFAs, particularly arachidonic acid (AA) and, to a lesser extent, EPA and DHA, depending on the animal's diet Redruello-Requejo2023Abedi2014Mititelu2024+2 MORE.
Meat and meat products: Main providers of AA and also contribute to ALA intake in some populations .

Dietary Patterns and Recommendations

Mediterranean diet: Emphasizes fish, olive oil, nuts, and seeds, providing a favorable balance of PUFAs and associated polyphenols Mititelu2024Coniglio2023.
Western diets: Often high in saturated fats and low in omega-3 PUFAs, leading to an imbalanced omega-6/omega-3 ratio .

Conclusion

PUFAs are vital for health and must be obtained from the diet. Key sources include oily fish and seafood for EPA and DHA, plant seeds and oils for ALA and LA, and emerging sources like microalgae and genetically modified crops for sustainable long-chain PUFA production. Increasing the intake of these foods, especially omega-3-rich sources, is recommended to support optimal health and address common dietary inadequacies Saini2021Redruello-Requejo2023Kapoor2021+7 MORE.

Sources and full results

Most relevant research papers on this topic

Omega−3 Polyunsaturated Fatty Acids (PUFAs): Emerging Plant and Microbial Sources, Oxidative Stability, Bioavailability, and Health Benefits—A Review

Omega-3 PUFAs from plants, microalgae, and thraustochytrids show promising nutritional benefits and oxidative stability, with potential for commercial production and future health benefits.

Rigorous Journal

2021·

256citations

·R. Saini et al.

Antioxidants·

DOI

Omega-3 and Omega-6 Polyunsaturated Fatty Acid Intakes, Determinants and Dietary Sources in the Spanish Population: Findings from the ANIBES Study

Insufficient intake of omega-3 PUFA is prevalent in the Spanish population, with 65% showing insufficient intake, and dietary sources include oils, fats, meat, and meat products.

2023·

22citations

·Marina Redruello-Requejo et al.

Nutrients·

DOI

Dietary Polyunsaturated Fatty Acids (PUFAs): Uses and Potential Health Benefits

Omega-3 and omega-6 fatty acids in food contribute to improved physical functioning and metabolic rate, while also protecting against diseases like osteoarthritis, cancer, and autoimmune disorders.

Literature Review

2021·

318citations

·Bharat Kapoor et al.

Current Nutrition Reports·

DOI

Long-chain polyunsaturated fatty acid sources and evaluation of their nutritional and functional properties

Long-chain polyunsaturated fatty acids are essential for human health and can be found in various sources, including aquatic, animal, plant, and microorganisms.

2014·

510citations

·E. Abedi et al.

Food Science & Nutrition·

DOI

Polyunsaturated Fatty Acids and Human Health: A Key to Modern Nutritional Balance in Association with Polyphenolic Compounds from Food Sources

Increased intake of polyunsaturated fatty acids and polyphenols in plant-based foods can help mitigate the global burden of diet-related health issues and promote overall well-being.

Literature Review

2024·

94citations

·Magdalena Mititelu et al.

Foods·

DOI

Polyunsaturated Fatty Acids as Dietary Supplements: Biological Activities and Sources

Polyunsaturated fatty acids (PUFAs) have diverse biological activities, and new dietary sources are needed as PUFA consumption rises due to new dietary recommendations.

Literature Review

2016·

2citations

·D. Hardman et al.

DOI

Promising Sources of Plant-Derived Polyunsaturated Fatty Acids: A Narrative Review

Algae, microorganisms, plants rich in stearidonic acid, and GM plants show promise as sustainable, acceptable sources of omega-3 fatty acids, but further investigation is needed on costs, acceptance, and formulation.

Systematic Review

2023·

64citations

·Gianluca Rizzo et al.

International Journal of Environmental Research and Public Health·

DOI

Innovative dietary sources of n-3 fatty acids.

N-3 PUFAs are now being incorporated into nontraditional food sources, such as canola and soybean oil, and algal sources, to enhance health promotion and disease prevention.

2006·

227citations

·J. Whelan et al.

Annual review of nutrition·

DOI

Unsaturated Fatty Acids and Their Immunomodulatory Properties

A diet high in -3 polyunsaturated fatty acids and low in -6 fats, primarily from plant seeds and fish, reduces inflammation and has a positive impact on human health.

Literature Review

2023·

124citations

·Salvatore J Coniglio et al.

Biology·

DOI

Polyunsaturated Fatty Acids: Conversion to Lipid Mediators, Roles in Inflammatory Diseases and Dietary Sources

Polyunsaturated fatty acids play a crucial role in inflammatory diseases, with n-3 PUFAs being anti-inflammatory and n-6 PUFAs being pro-inflammatory, and their dietary sources are limited.

Literature Review

2023·

91citations

·J. Harwood

International Journal of Molecular Sciences·

DOI

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