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Related Concept Videos

Lipid-derived Compounds in the Human Body01:31

Lipid-derived Compounds in the Human Body

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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 .
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,...
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Lipids: Dietary Sources and Requirements01:18

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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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Lipid Digestion

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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Structure of Lipids03:38

Structure of Lipids

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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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Structure of Lipids03:38

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Updated: Mar 17, 2026

Enzymatic Synthesis of Epoxidized Metabolites of Docosahexaenoic, Eicosapentaenoic, and Arachidonic Acids
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Docosahexaenoic acid: one molecule diverse functions.

Michio Hashimoto1, Shahdat Hossain1,2, Abdullah Al Mamun1

  • 1a Department of Environmental Physiology , Shimane University Faculty of Medicine , Izumo , Japan.

Critical Reviews in Biotechnology
|July 19, 2016
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Summary

Docosahexaenoic acid (DHA) is vital for brain health, enhancing memory and cognitive function. Supplementation may protect against age-related cognitive decline and neurodegenerative diseases like Alzheimer's.

Keywords:
Alzheimer’s diseaseDHAantioxidative defensehypertensionlearning and memoryneurogenesis

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Area of Science:

  • Neuroscience
  • Nutritional Science
  • Biochemistry

Background:

  • Docosahexaenoic acid (DHA), an omega-3 fatty acid, is concentrated in neuronal membranes and crucial for brain development and function.
  • DHA deficiency is linked to impaired memory, cognitive decline, and neurodegenerative diseases such as Alzheimer's disease (AD).

Purpose of the Study:

  • To review the diverse functions of DHA in brain health and cognitive processes.
  • To highlight the protective effects of DHA against age-related cognitive decline and AD.

Main Methods:

  • Review of existing research on DHA's role in brain function, memory, and neuroprotection.
  • Analysis of studies involving oral DHA administration in animal models of AD and human aging.

Main Results:

  • Oral DHA administration enhances spatial memory, stimulates neurogenesis, and reverses memory impairment in AD models.
  • DHA protects against age-related cognitive decline and may reduce amyloid burden in the brain.
  • DHA influences membrane fluidity, antioxidant activity, and protein expression related to memory.

Conclusions:

  • DHA is strongly linked to cognitive health and plays a multifaceted role in brain function.
  • Maintaining adequate DHA levels is essential for preventing cognitive impairment and neurodegeneration.
  • Further research into DHA's mechanisms of action is warranted.