Polyunsaturated Fatty Acids and Their Beneficial Effect Onheart Disease: A Review

Polyunsaturated Fatty Acids (PUFAs), encompassing Omega-3 and Omega-6 fatty acids, have gained significant attention in recent decades for their cardioprotective properties. These essential fatty acids, derived primarily from dietary sources such as fish, nuts, seeds, and plant oils, play pivotal roles in maintaining cardiovascular health. Their beneficial effects are attributed to their ability to modulate lipid profiles, reduce inflammation, and improve vascular function. Omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are well-documented for reducing triglyceride levels, lowering blood pressure, and mitigating arrhythmias. Additionally, omega-3s possess anti-inflammatory properties, mediated through the production of bioactive lipid mediators like resolvins and protectins, which help attenuate chronic inflammatory processes implicated in atherosclerosis. Omega-6 fatty acids, such as linoleic acid, contribute to cardiovascular health by lowering LDL cholesterol levels when consumed as part of a balanced diet, though their benefits depend on an appropriate omega-6 to omega-3 ratio. Clinical and epidemiological studies have demonstrated that diets rich in PUFAs are associated with reduced incidence of coronary heart disease (CHD) and improved outcomes in heart failure and post-myocardial infarction patients. For example, largescale studies such as the GISSI-Prevenzione trial have shown that omega-3 supplementation significantly decreases the risk of sudden cardiac death. Mechanistic insights further reveal that PUFAs improve endothelial function, reduce platelet aggregation, and stabilize atherosclerotic plaques, thereby reducing the risk of adverse cardiovascular events.