我国人民膳食中动物性食品较少,膳食维生素A主要来源于蔬菜中的胡萝卜素。文献报导当大白鼠用酪蛋白或乳白蛋白等优质蛋白饲料时,食入胡萝卜素后肝肾中维生素A的含量或血中维生素A含量均高于食谷蛋白(Gluten)或玉米醇溶蛋白(Zein)的动物,即胡萝卜素转变为维生素A的效果较好。Wilson等指出人食入胡萝卜或菠菜后被吸收的胡萝卜素占总摄入量的80—90%,若于膳食中除去食用油脂,则仅吸 Chinese people’s diet less animal foods, dietary vitamin A is mainly derived from vegetables in the carotene. Reported in the literature when rats with high protein casein or lactalbumin feed, after ingestion of carotene liver and kidney vitamin A or vitamin A content were higher than gluten (Gluten) or zein Zein) animals, carotene into vitamin A better effect. Wilson et al. Pointed out that carotenoids, which are absorbed by humans into carrots or spinach, make up 80-90% of the total intake. If the dietary fat is removed, then only the