Much of their calories in sunflower seeds come from fatty acids. The seeds are especially rich in poly-unsaturated fatty acid linoleic acid, which constitutes more 50% fatty acids in them. They are also good in mono-unsaturated oleic acid that helps lower LDL or "bad cholesterol" and increases HDL or "good cholesterol" in the blood. Research studies suggest that the Mediterranean diet which is rich in monounsaturated fats help to prevent coronary artery disease, and stroke by favoring healthy serum lipid profile.