无论是铁棍山药，还是普通山药，淀粉含量和红薯差不多，可以用来代替部分主食。
而且山药的升糖指数 GI 为 51，对于血糖控制有需求的人来说，也比较友好。
两种山药的营养价值差别并不大。铁棍山药的水分，蛋白质和淀粉含量较少，而钾元素相比较丰富一点。
至于为啥铁棍山药贵一些，主要还是因为产量低，毕竟物以稀为贵嘛。[/cp]
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