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Agriculture and nutrition农业与营养 Hidden hunger隐性饥饿 How much can farming really improve peopleshealth? 农业到底能为促进人类健康贡献多少? IN A market in southern Uganda two traders squatbehind little piles of sweet potatoes and a sign thatsays with extra vitamin A. A passing shoppercomplains about the price: 10% more than ordinarysweet potatoes. Yes, say the traders, but theyrebetter, bred with extra vitamin A. The bargaininggoes back and forth, but the struggle to improve thecrop has already been won. Since 2007, when an outfit called HarvestPlus began distributing thebiofortified rootcrop in Uganda and Mozambique, 50,000 farmers have started to plant it orcrops like it. Vitamin A intake has soared and the produce commands a premium. The shoppereventually buys some. 乌干达南部的一个市场上，两个小贩蹲坐在一小堆红薯边，一旁的牌子上写着富含维A。顾客路过，抱怨价格太贵：比一般红薯贵10%。贵是贵一点，小贩解释道，但是这种红薯更优质，富含更多维A。虽然还要再讨价还价一番，但已经确定的是作物营养价值方面已经有所进步了。自 2007年，供应商HarvestPlus开始在乌干达和莫桑比亚销售生物合成的块根作物，近5万农户开始种植此类作物。维A含量的显著增多，使得产品价格升高。顾客最终也逐渐开始购买此类农产品。 | 
