The solution for any nutritional deficiencies is not the "fortification" of the staple foods.<p>I believe that the future of food sources is in genetically-engineered organisms, but I am dismayed by the fact that all the current attempts of genetic modifications have stupid goals.<p>The "fortification" of staple foods is extremely stupid, because the amount of staple food that is consumed varies widely with sex, size, age and physical activity and it is not proportional to the daily requirements for various vitamins or minerals. The amount of vitamins ingested from "fortified" food is always either insufficient or wasted as excessive.<p>The staple foods are required to provide only proteins and/or fats and/or carbohydrates. For everything else there are specific sources that are needed only in small quantities, so they usually do not add up to a major part of the cost of the food.<p>The daily intake of vitamin A can be obtained for instance from 100 grams of carrots, which in Europe, where I live, cost much less than 10 cents, so they can be afforded by anyone. In other parts of the world, where carrots are less common, there are various vegetables with similar properties, e.g. sweet potatoes and many others.<p>If they have vitamin A deficiency in their population, the solution is not buying more expensive yellow rice, but teaching everyone which is the amount of the cheapest locally available vegetable that is a suitable source of beta-carotene, which must be eaten daily.