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流行病学研究表明，某些癌症的发生率与水果蔬菜食物中的胡萝卜素类的含量呈负相关，认为胡萝卜素类是一种可能有效的癌症化学预防剂［1-2］。有报道肿瘤病人的血清卜胡萝卜素水平明显低于健康人[3-4]。补充β-胡萝卜素或食用含胡萝卜素丰富的食物可以明显降低恶性肿瘤的发病率
Epidemiological studies have shown that the incidence of certain cancers is negatively correlated with the content of carotenoids in fruits, vegetables and fruits, and that carotenes are a potentially effective chemopreventive agent for cancer [1-2]. It has been reported in cancer patients serum b-carotene levels were significantly lower than healthy people [3-4]. Supplementation of β-carotene or carotene-rich foods can significantly reduce the incidence of malignant tumors