A possible contribution of decrease in free fatty acids to low serum triglyceride levels after diets supplemented...

Area of Science:

• Cardiovascular Nutrition
• Lipid Metabolism
• Dietary Fatty Acids

Background:

• Primary hyperlipoproteinemia (HLP) is characterized by elevated blood lipid levels.
• Dietary interventions are crucial for managing HLP.
• Polyunsaturated fatty acids (PUFA) are known for their potential lipid-lowering effects.

Purpose of the Study:

• To compare the effects of different PUFA-rich diets on lipid profiles and glucose metabolism in HLP patients.
• To investigate the impact of linoleic acid (LA), alpha-linolenic acid (LNA), and marine-derived eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on HLP.

Main Methods:

• Intraindividual dietary comparison in 30 HLP patients (phenotypes IIa, IIb, IV, V).
• Diets supplemented with sunflowerseed oil (LA), linseed oil (LNA), and canned mackerel (EPA/DHA).
• Assessment of lipid levels, apolipoproteins, blood pressure, and free fatty acids during a glucose tolerance test (GTT).

Main Results:

• PUFA-rich diets, especially those high in EPA and DHA, lowered lipids and blood pressure across all HLP phenotypes.
• Apolipoproteins A-I and B levels remained unchanged.
• Significant reduction in free fatty acids (FFA) during GTT was observed, particularly with n-3 PUFA diets, correlating with decreased serum triglycerides.

Conclusions:

• Diets rich in n-6 and n-3 PUFA demonstrate lipid-lowering effects in HLP patients.
• Reduced peripheral lipolysis, indicated by lower FFA levels, is a potential mechanism for the triglyceride-lowering action of PUFA.
• EPA and DHA-rich diets show a pronounced effect on reducing FFA and triglycerides.