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Structure of Lipids

Structure 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...

Structure of Lipids

Structure 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...

Structure of Lipids

Structure 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...

Overview of Fatty Acid Metabolism

Overview 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...

What are Lipids?

What are Lipids?

What are Lipids?

What are Lipids?

Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms. The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
Non-Polar and Hydrophobic Characteristics of Lipids
Lipids are a structurally and functionally diverse group of hydrocarbons—compounds consisting of carbon and hydrogen atoms. The carbon-carbon and carbon-hydrogen bonds...

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Related Experiment Video

Updated: Jun 18, 2026

Dietary Supplementation of Polyunsaturated Fatty Acids in Caenorhabditis elegans

Dietary Supplementation of Polyunsaturated Fatty Acids in Caenorhabditis elegans

Published on: November 29, 2013

Understanding omega-3 polyunsaturated fatty acids.

Philip C Calder¹, Parveen Yaqoob

¹Institute of Human Nutrition School of Medicine, Southampton General Hospital, Southampton, UK. pcc@soton.ac.uk

Postgraduate Medicine

|November 27, 2009

Summary

This summary is machine-generated.

Increasing intake of omega-3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), supports health and disease prevention. Preformed EPA and DHA from sources like fish oil are more beneficial than plant-based alpha-linolenic acid (ALA).

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Last Updated: Jun 18, 2026

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Published on: November 29, 2013

Enzymatic Synthesis of Epoxidized Metabolites of Docosahexaenoic, Eicosapentaenoic, and Arachidonic Acids

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Published on: May 1, 2017

Area of Science:

Nutrition Science
Biochemistry
Human Physiology

Background:

Low intake of omega-3 fatty acids (EPA and DHA) is common in Western populations.
Seafood and fish oil are primary sources of these essential fatty acids.
Alpha-linolenic acid (ALA) conversion to EPA is limited, and to DHA is poor in humans.

Purpose of the Study:

To review the incorporation and physiological effects of very long-chain omega-3 fatty acids.
To highlight the health benefits and disease protective roles of EPA and DHA.
To compare the efficacy of preformed EPA/DHA with ALA for health outcomes.

Main Methods:

Literature review on omega-3 fatty acid metabolism and function.
Analysis of dose-dependent incorporation into lipid pools.
Examination of cellular and tissue-level effects of EPA and DHA.

Main Results:

EPA and DHA are readily incorporated into various body pools in a dose-dependent manner.
These fatty acids modulate cell membranes, signaling, and gene expression.
Benefits include improved cardiovascular health, reduced mortality, and potential therapeutic effects in conditions like rheumatoid arthritis.

Conclusions:

Increased intake of preformed EPA and DHA is recommended for optimal health and disease prevention.
Direct consumption of EPA and DHA offers greater health benefits than relying on ALA conversion.
Omega-3 fatty acids play a crucial role in maintaining physiological balance and responding to external stimuli.