Staple to SuperfoodSweet potatoes were among the American crops Christopher Columbus brought back to Europewhere they were thought to be an aphrodisiac. In China, this versatile root became a staple that fueled rapid population growth. Introduced to Japan to stave off famine, sweet potatoes later sustained the country's imperial expansion. Because this hardy plant can thrive in almost any soil, it has long been cultivated as a subsistence crop in Southeast Asia, Africa,