Potatoes can produce more energy per unit area per day than any other crop, and it is possible (though tedious) to subsist on a diet of spuds and very little else.

• 以每天每单位面积来计算，它所产生的能量比任何其它粮食作物都要多。而且只要有了它，人类便几乎不需要其它食物来维系其生存了（虽然这样的食谱过于单调乏味）。