The best source of omega-3 fatty acids is fatty fish, such as salmon, mackerel, and sardines. These fish are rich in EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), essential nutrients that support heart and brain health. For those who follow a plant-based diet, sources like chia seeds, flaxseeds, and walnuts provide ALA (alpha-linolenic acid), another form of omega-3. Incorporating these foods into the diet can contribute to overall health.