Cheng Cheng-yung, a professor of horticulture at National Taiwan University, takes the following example from Japanese research: 30 years ago, there were 13 milligrams of minerals in every 100 grams of spinach, but today there are only 3.7. Components like Vitamin C, which have antioxidant properties, have suffered the same fate.
台大園藝系教授鄭正勇舉日本食品界的研究為例，30 年前，每 100 公克菠菜中，含有 13 毫克的礦物質，現在只剩下 3.7 毫克；可以抗氧化的維生素 C 等元素也遭到同樣命運。