Are sunflower seeds fattening?
They contain healthy fats which are necessary for aiding weight reduction, lowering cholesterol, enhancing immunity and nourishing the reproductive organs, skin, hair and bone tissue, effectively lubricating our bodies. These are the good fats, vitally important and necessary for life itself. And these fats help you to metabolize fat. They are so important that they are called essential fatty acids (EFAs). Your body cannot make EFAs, so you must get them through the foods you eat. Sunflower seeds are very high in EFAs, so they're very good for you! Avoid the roasted and salted brands though! Go for dry roasted (raw) and unsalted brands.
They were never "invented". Sunflower seeds are just that, sunflower seeds. Seeds that contain the genetic makeup up sunflowers that will then germinate in the soil to become a sunflower which will make more sunflower seeds. The question "When did people begin eating sunflower seeds?" is another topic