Jumping on the omega-3 bandwagon: distinguishing the role of long-chain and short-chain omega-3 fatty acids

Crit Rev Food Sci Nutr. 2012;52(9):795-803. doi: 10.1080/10408398.2010.509553.

Abstract

Omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) are almost unanimously recognized for their health benefits, while only limited evidence of any health benefit is currently available specifically for the main precursor of these fatty acids, namely α-linolenic acid (ALA, 18:3n-3). However, both the n-3 LC-PUFA and the short-chain C₁₈ PUFA (i.e., ALA) are commonly referred to as "omega-3" fatty acids, and it is difficult for consumers to recognize this difference. A current gap of many food labelling legislations worldwide allow products containing only ALA and without n-3 LC-PUFA to be marketed as "omega-3 source" and this misleading information can negatively impact the ability of consumers to choose more healthy diets. Within the context of the documented nutritional and health promoting roles of omega-3 fatty acids, we briefly review the different metabolic fates of dietary ALA and n-3 LC-PUFA. We also review food sources rich in n-3 LC-PUFA, some characteristics of LC-PUFA and current industry and regulatory trends. A further objective is to present a case for regulatory bodies to clearly distinguish food products containing only ALA from foods containing n-3 LC-PUFA. Such information, when available, would then avoid misleading information and empower consumers to make a more informed choice in their food purchasing behavior.

Publication types

  • Comparative Study
  • Review

MeSH terms

  • Animals
  • Dietary Supplements / analysis*
  • Dietary Supplements / standards
  • Docosahexaenoic Acids / administration & dosage
  • Docosahexaenoic Acids / chemistry
  • Docosahexaenoic Acids / metabolism
  • Eicosapentaenoic Acid / administration & dosage
  • Eicosapentaenoic Acid / chemistry
  • Eicosapentaenoic Acid / metabolism
  • Fatty Acids, Omega-3 / administration & dosage
  • Fatty Acids, Omega-3 / chemistry
  • Fatty Acids, Omega-3 / metabolism*
  • Fatty Acids, Unsaturated / administration & dosage
  • Fatty Acids, Unsaturated / chemistry
  • Fatty Acids, Unsaturated / metabolism
  • Food Labeling / legislation & jurisprudence
  • Food Labeling / standards
  • Food, Fortified / analysis*
  • Food, Fortified / standards
  • Global Health
  • Health Promotion*
  • Humans
  • Molecular Weight
  • Terminology as Topic
  • alpha-Linolenic Acid / administration & dosage
  • alpha-Linolenic Acid / chemistry
  • alpha-Linolenic Acid / metabolism

Substances

  • Fatty Acids, Omega-3
  • Fatty Acids, Unsaturated
  • alpha-Linolenic Acid
  • Docosahexaenoic Acids
  • Eicosapentaenoic Acid
  • docosapentaenoic acid