Filling up on omega-3 fatty acids does a body good. These polyunsaturated fats, which play a crucial role in how your body's cells function, have been shown to reduce harmful inflammation that could lead to heart disease, decrease triglyceride levels and blood pressure, and prevent fatal heart arrhythmias. Your body can't produce omega-3s, though, so you've got to be diligent about making sure your diet provides them. The good news is the fatty acids hide in tons of foods, like beans, certain oils and veggies, and—as you probably know—seafood. Take a look at these favorite sources.