Omega-3 fatty acids are considered healthy because these essential nutrients reduce the risk of dying from heart disease, according to the Mayo Clinic. Despite warnings about eating fish with elevated mercury levels, eating one serving of oily ocean fish at least twice per week has shown to reduce heart disease when the fish are baked or broiled rather than deep-fried.
Clinical evidence is strong with regard to omega-3 fatty acids reducing heart disease and heart problems. The University of Maryland Medical Center reveals studies have shown that omega-3 fatty acids can be used to treat high cholesterol, high blood pressure, heart disease, diabetes, rheumatoid arthritis, lupus and osteoporosis. Omega-3 fatty acids also treat depression, bipolar disorder, schizophrenia, attention deficit/hyperactivity disorder (ADHD), cognitive decline such as Alzheimer's disease, skin disorders, inflammatory bowel disease, asthma, macular degeneration, menstrual pain, colon cancer, breast cancer and prostate cancer.
Omega-3 fatty acids reduce levels of cholesterol and triglycerides in the blood, according to the University of Rochester Medical Center's Health Encyclopedia. Elevated cholesterol and triglyceride levels can lead to coronary heart disease, a malady that can lead to a heart attack due to clogged arteries from plaque build up. Omega-3 fatty acids prevent inflammation of the blood vessels and can decrease blood pressure to keep the heart healthy.