Related Experiment Video
Updated: May 27, 2026
09:38
Dietary Supplementation of Polyunsaturated Fatty Acids in Caenorhabditis elegans
Published on: November 29, 2013
Sex-specific differences in essential fatty acid metabolism
1Department of Pediatrics, University of Pécs, Pécs, Hungary. tamas.decsi@aok.pte.hu
The American Journal of Clinical Nutrition
|November 18, 2011
Summary
Sex hormones influence long-chain polyunsaturated fatty acid (LC-PUFA) synthesis, leading to sex-specific differences. Women show higher conversion of alpha-linolenic acid (ALA) to omega-3 LC-PUFAs than men.
Area of Science:
- Biochemistry
- Human Nutrition
- Endocrinology
Background:
- Sex hormones may impact the enzymatic synthesis of long-chain polyunsaturated fatty acids (LC-PUFAs).
- Existing literature suggests potential sex-specific differences in LC-PUFA status, particularly concerning arachidonic acid (AA) and docosahexaenoic acid (DHA).
Purpose of the Study:
- To review and synthesize current knowledge on sex-specific differences in LC-PUFA status and metabolism.
- To highlight the implications for planning future research, especially in perinatal supplementation trials.
Main Methods:
- Review of existing literature on LC-PUFA synthesis and sex differences.
- Analysis of isotope studies using U-(13)C alpha-linolenic acid (ALA) to assess conversion rates.
- Examination of large-scale population data on plasma phospholipid fatty acid composition.
Main Results:
- Isotope studies indicate a higher conversion rate of ALA to n-3 (omega-3) LC-PUFAs in women compared to men.
- A large European study showed higher saturated and monounsaturated fatty acids, and lower AA and DHA in men's plasma phospholipids than in women's.
- Sex accounted for only about 2% of the variability in plasma phospholipid DHA levels.
Conclusions:
- Sex hormones play a role in LC-PUFA metabolism, contributing to observed sex-specific differences.
- While differences exist, the extent is often small, and variability is influenced by other factors.
- Future perinatal LC-PUFA supplementation trials should incorporate subgroup analyses by sex to better understand effects.
Related Concept Videos
01:28Overview of Fatty Acid Metabolism
Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
01:29Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
03:38Structure of Lipids
Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
01:31Lipid-derived Compounds in the Human Body
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...
01:18Lipids: Dietary Sources and Requirements
Lipids are an essential component of a balanced human diet. Triglycerides, which make up the majority of dietary lipids, are found in both saturated fats—commonly present in meat, dairy products, and certain tropical plants like coconut, and hydrogenated oils such as margarine and baking shortenings (trans fats)—and unsaturated fats, which are abundant in seeds, nuts, olive oil, and most vegetable oils. The main sources of cholesterol include egg yolks, various meats and organ meats, shellfish,...
01:24Overview of Lipid Metabolism
Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...
Lipolysis: The Breakdown of Lipids:
Lipolysis is the process of breaking down lipids, particularly triglycerides, into glycerol and fatty acids. This process typically occurs in the adipose tissue and is triggered by various hormones, including glucagon and...