U01.01.069 Essential fatty acids

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Learning Objectives

  • Differentiate between Omega-3 and Omega-6 fatty acids.
  • Identify the clinical significance of Linoleic and Linolenic acids.
  • Understand the impact of Trans-fatty acids on lipid profiles (LDL and HDL).

1. Definition & Sources

Essential fatty acids are polyunsaturated fatty acids (PUFAs) that the human body cannot synthesize de novo because it lacks the enzymes to insert double bonds past the \Delta^9 position. They must be obtained through the diet.

  • Dietary Sources: Nuts, seeds, plant oils, and cold-water seafood.

2. Metabolism and Clinical Impact

Fatty Acid Metabolic Pathway Clinical Effects
Linoleic Acid (Omega-6) Precursor to Arachidonic Acid. Leads to the production of Leukotrienes and Prostaglandins.
Linolenic Acid (Omega-3) Metabolized to EPA and DHA. Cardioprotective and antihyperlipidemic effects.

3. Trans-Fatty Acids vs. Cardiovascular Health

Unlike cis-polyunsaturated fats, trans-unsaturated fatty acids (often found in partially hydrogenated oils and fast food) are detrimental to the lipid profile:

  • LDL: Increases (pro-atherogenic).
  • HDL: Decreases (loss of protective effect).
  • Result: Promotes cardiovascular disease and systemic inflammation.

 

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