Proper nutrition and a balanced diet are key to children's well-being, keeping them healthy and supporting cognitive development. A diet without nutrients like iron or folic acid can have serious effects. But in the developing world, the correct nutrients aren't always in children's diets. Adding those nutrients to the available food - even to foods in which they don't occur naturally - can be a huge boost to public health. It's a lesson we learned in the United States long ago, and one we need to apply to the rest of the world.