Cited by 1,162Fatty Acid Research and HealthAquaculture Nutrition and GrowthLipid metabolism and biosynthesis

Distribution, interconversion, and dose response of n-3 fatty acids in humans.

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Arterburn, Linda M, Hall, Eileen Bailey, Oken, Harry·2006·The American Journal of Clinical Nutrition

Abstract

n-3 Fatty acids have important visual, mental, and cardiovascular health benefits throughout the life cycle. Biodistribution, interconversion, and dose response data are reviewed herein to provide a basis for more rational n-3 dose selections. Docosahexaenoic acid (DHA) is the principal n-3 fatty acid in tissues and is particularly abundant in neural and retinal tissue. Limited storage of the n-3 fatty acids in adipose tissue suggests that a continued dietary supply is needed. A large proportion of dietary alpha-linolenic acid (ALA) is oxidized, and because of limited interconversion of n-3 fatty acids in humans, ALA supplementation does not result in appreciable accumulation of long-chain n-3 fatty acids in plasma. Eicosapentaenoic acid (EPA) but not DHA concentrations in plasma increase in response to dietary EPA. Dietary DHA results in a dose-dependent, saturable increase in plasma DHA concentrations and modest increases in EPA concentrations. Plasma DHA concentrations equilibrate in approximately 1 mo and then remain at steady state throughout supplementation. DHA doses of approximately 2 g/d result in a near maximal plasma response. Both dietary DHA and EPA reduce plasma arachidonic acid concentrations. Tissue contents of DHA and EPA also increase in response to supplementation with these fatty acids. Human milk contents of DHA are dependent on diet, and infant DHA concentrations are determined by their dietary intake of this fatty acid. We conclude that the most predictable way to increase a specific long-chain n-3 fatty acid in plasma, tissues, or human milk is to supplement with the fatty acid of interest.

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  • The conversion of LA to AA and ALA to EPA and then DHA is inefficient in humans.

    “Further, while LA can be converted to AA and ALA can be converted to EPA and then DHA, respectively, this conversion is inefficient in humans [59]”

    From Role of Omega-3 Fatty Acids in Improving Metabolic Dysfunctions in Polycystic Ovary Syndrome (2024) · cites this paper as [59]

    The Introduction says conversion of ALA to EPA and DHA is relatively inefficient in humans, and the Metabolic Interconversion section reports low conversion rates. That section also identifies LA-to-arachidonic-acid conversion, but does not say that this conversion is inefficient. No page number is available in our copy. (LLM, conf=0.88)

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  • Only ALA is truly essential to the human diet; EPA and DHA can be synthesised from ALA in liver endoplasmic reticulum, though conversion is limited by enzyme availability.

    “Only ALA is considered truly essential to the human diet as both EPA and DHA can be synthesised in the endoplasmic reticulum in liver cells through conversion from ALA, though this conversion is limited due to enzyme availability [38,39,40].”

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  1. Gerster H. Can adults adequately convert alpha-linolenic acid (18: 3nҀ3) to eicosapentaenoic acid (20:5nҀ3) and docosahexaenoic acid (22:6nҀ3)? Int J Vitam Nutr Res 1998;68:159 -73.

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Authors
Arterburn, L. M., Hall, E. B., & Oken, H.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Arterburn, Linda M
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2006-06
Volume
83
Issue
6
Pages
1467S-1476S
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2104285446
Cited by
1,162
References
108
Citations by year
2026: 17 · 2025: 50 · 2024: 30 · 2023: 36 · 2022: 46 · 2021: 57 · 2020: 64 · 2019: 68 · 2018: 58 · 2017: 78 · 2016: 94 · 2015: 71 · 2014: 79 · 2013: 82 · 2012: 77
FWCI
5.12
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Fatty Acid Research and Health
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
Keywords
omega-3 fatty acids, docosahexaenoic acid, eicosapentaenoic acid, alpha-linolenic acid, dietary supplementation, dose-response relationship, plasma fatty acid concentrations, arachidonic acid, breast milk, fatty acid oxidation, adipose tissue storage
MeSH terms
Docosahexaenoic Acids, Dose-Response Relationship, Drug, Erythrocytes, Humans, Milk, Human, Organ Specificity, Tissue Distribution, Eicosapentaenoic Acid, Fatty Acids, Omega-3, alpha-Linolenic Acid, Dietary Supplements

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