The human body can produce most fats from raw ingredients and other fat. This isn't true with respect to omega-3 fatty acids, however. They are essential fats, meaning the body cannot produce them by itself but must obtain them from food. The human brain is largely made up of omega-3 fatty acids, meaning organic food is literally brain food.
Learn more: http://www.naturalnews.com/053416_GMO_food_organic_nutritional_comparison.html#ixzz4BNcJ3qks