Because geographical and cultural differences in diet, that's one. Because supplementation programs failed, that's two. Because people most in need are simult

Because geographical and cultural differences in diet, that's one. Because supplementation programs failed, that's two. Because people most in need are simultaneously too poor and in areas that aren't well served by modern distribution networks, that's three. What the target, people suffering from lack of vitamin A in among other places India, however, do have: Diet that is heavily dependant on rice, that's one Considerable access to rice as locally produced staple crop, that's two. Don't need any new distribution or support in order to grow Golden Rice vs. existant local cultivars and have a supply network for it already in place, that's three.