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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...
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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...
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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 .
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Enzymatic Synthesis of Epoxidized Metabolites of Docosahexaenoic, Eicosapentaenoic, and Arachidonic Acids
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Docosahexaenoic Acid.

Philip C Calder1

  • 1Faculty of Medicine, University of Southampton, and NIHR Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK.

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|November 15, 2016
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Summary
This summary is machine-generated.

Docosahexaenoic acid (DHA) is a vital omega-3 fatty acid crucial for brain and eye health. Due to inefficient synthesis from ALA, preformed DHA from diet or supplements is often necessary for optimal development.

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Area of Science:

  • Biochemistry
  • Nutritional Science
  • Neuroscience

Background:

  • Docosahexaenoic acid (DHA) is a key long-chain omega-3 fatty acid.
  • DHA can be synthesized from alpha-linolenic acid (ALA), but this conversion is often inefficient in humans.
  • DHA is critical for the structure and function of the brain and eyes.

Purpose of the Study:

  • To review the metabolic pathways and importance of DHA.
  • To highlight the implications of inefficient ALA to DHA conversion.
  • To discuss dietary sources and the role of DHA in cognitive and visual development.

Main Methods:

  • Literature review of DHA metabolism and function.
  • Analysis of factors affecting ALA to DHA conversion rates.
  • Examination of DHA's role in infant and adult physiology.

Main Results:

  • DHA synthesis from ALA is inefficient, particularly in men.
  • Infants show variable but potentially higher conversion rates than adults.
  • Preformed DHA is essential, found in seafood and supplements.
  • High DHA concentrations in the brain and retina are linked to cognitive and visual function.

Conclusions:

  • Dietary intake of preformed DHA is crucial due to limited endogenous synthesis.
  • Adequate DHA levels are vital for optimal brain and visual development, especially during late pregnancy and early infancy.
  • DHA influences cellular functions through membrane properties and signaling pathways.