Begum A, Pereira S M
Trop Geogr Med. 1977 Mar;29(1):47-50.
Thirtytwo varieties of edible green leaves were analysed for their beta carotene content in different seasons of the year. Several varieties were found to contain enough beta carotene to provide the daily requirements of vitamin A, even for an adult person, from a moderate serving (30g-100g).
对32种可食用绿叶蔬菜在一年中的不同季节进行了β-胡萝卜素含量分析。结果发现,即使是成年人,食用适量(30克至100克)的几种绿叶蔬菜,其β-胡萝卜素含量就足以满足每日维生素A的需求。