translation.en: The food they produce have been proven to cause cancer and other problems in lab animals, and people have been eating food produced this way since the 1990s.
translation.zh: 转基因的食物被证明 若是用于实验动物会引发癌症和其它问题。 自从1990年代起，人们一直在吃 这些转基因的食物。