Alpha-linolenic acid and cardiovascular diseases

Area of Science:

• Cardiovascular Science
• Nutritional Science
• Biochemistry

Background:

• Dietary saturated fat was historically linked to coronary heart disease (CHD) via serum cholesterol.
• Intervention trials enriching diets with linoleic acid (LA) showed no significant reduction in cardiac mortality.
• n-3 fatty acids (FA), particularly alpha-linolenic acid (ALA), demonstrated a reduction in cardiac death.

Purpose of the Study:

• To evaluate the efficacy of ALA in preventing cardiac mortality compared to LA.
• To investigate the mechanisms by which ALA impacts cardiac events and thrombosis.
• To propose ALA as a potential nutritional intervention for CHD in industrialized nations.

Main Methods:

• Review of intervention trials and animal/in vitro studies on fatty acid effects on cardiac health.
• Analysis of ALA's impact on ventricular fibrillation, platelet aggregation, and thrombosis.
• Examination of ALA's role as a precursor to other n-3 fatty acids like EPA and DHA.

Main Results:

• Diets enriched in LA did not significantly reduce cardiac mortality, despite lowering cholesterol.
• Enrichment with ALA led to reduced cardiac death, with potential to prevent ventricular fibrillation.
• ALA demonstrated effectiveness in lowering platelet aggregation, a key factor in thrombosis.

Conclusions:

• ALA may be more effective than EPA and DHA in preventing ventricular fibrillation.
• Higher ALA intake (2g/day) with a 5:1 LA/ALA ratio could be a safe nutritional strategy.
• ALA offers a promising nutritional approach to mitigate major causes of morbidity and mortality in industrialized countries.