They say that although carrots are rich in beta-carotene - a building block of flu-fighting vitamin A - sweet potatoes contain nearly twice as much。
专家们还说,虽然胡萝卜富含胡萝卜素--抗流感的维他命A的构成元素之一——红薯中的胡萝卜素含量约是它的两倍。
Similarly, while it is easy to start the day with a glass of orange juice, a handful of papaya contains 15 times more beta-cryptoxanthin - another vitamin A building block。
同样地,虽然每天早上喝一杯橘子汁并非难事,但食用少量木瓜就能获取15倍乃至更多的隐黄质——另一种维生素A构成元素。
Dr Keith Randolph, of U.S. vitamin pill manufacturer Nutrilite, said that while it was well known that many people do not eat enough fruit and vegetables, even those who ate the recommended five-a-day could do better。
来自美国维他命药片制造商纽崔莱的Keith Randolph博士表示,虽然大家都清楚地知道很多人并没有食用足够的蔬菜和水果,但那些听取建议坚持“每日五果蔬”的人会更健康。
"This data highlights the importance of not only the quantity but the significant impact that quality and variety of the fruits and vegetables can have."
“这一数据更强调了一点:数量固然重要,摄入果蔬的质量和多样性更加重要。”
But Dr Emma Williams, of the British Nutrition Foundation, said: "No food is a superfood if it is not part of a healthy, varied and balanced diet."
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