Fish and marine oils are excellent source of omega-3 fatty acids, special kind of polyunsaturated fatty acids that protect the cardiovascular system.  Fish oils are specifically rich in types of omega-3 fatty acids known as EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).  Note that fish is not the only source of omega-3 fatty acids.  They are also found in flaxseed oil and other vegetable oils.  But our body has to convert the omega-3s in those foods to the heart-healthy EPA and DHA contained in fish and fish oils.  Click here to learn more about healthy oils, omega-3s, and science-backed health benefits.