肺癌

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　　曾有一项调查显示，每日维生素A和在人体内可转化为维生素A的胡萝卜素摄入较少者，10年后发生肺癌的比率明显偏高。
    研究人员认为，维生素A可维持细胞核完整性，保证上皮组织正常代谢，加速细胞核DNA修复，阻断细胞癌变过程，抑制癌症发生。长期缺乏维生素A，可使呼吸道上皮发生鳞状化生，进一步发展，就容易导致肺癌。
　　维生素A主要存在于动物组织中，蛋黄、奶、奶油、鱼肝油、动物肝脏等维生素A含量较多，但这些食物胆固醇含量高、热量高，因而应注意摄入量，不宜食入过多。而西红柿、红薯、胡萝卜、南瓜、橘、橙、芒果、杏、苋菜、菠菜、韭菜、油菜、荠菜、茼蒿、青椒等黄色和绿色蔬菜、水果中，含有丰富的胡萝卜素，可以适当多吃，这不仅对预防肺癌有益，对高血压、糖尿病、血脂异常、冠心病等慢性病，也有一定预防效果。
    研究显示，微量元素硒可提高机体免疫力，硒元素摄入不足，也会增加肺癌发生的危险。虾、蟹、瘦肉、蛋、蘑菇、芝麻等食物中硒元素含量较高，可以适当摄入，但动物性食物不宜过多食用，否则不利于心脑血管健康。

====汉译英====
Had a survey, the daily vitamin A and in the human body can be transformed into vitamin A, carotene intake of less persons, 10 years after the apparent high rate of lung cancer.
    Researchers believe that vitamin A can maintain the integrity of the nucleus, to ensure the normal epithelial tissue metabolism, speed up the nuclear DNA repair, block cell carcinogenesis, inhibition of cancer. Long-term lack of vitamin A, can squamous metaplasia of respiratory epithelium, and further development, it is easy to cause lung cancer.
Vitamin A mainly in animal tissue, egg yolk, milk, butter, cod liver oil, vitamin A content in animal liver and other more, but these foods with high cholesterol, high-calorie, which should be noted that intake should not eat into too much. The tomatoes, sweet potatoes, carrots, pumpkin, orange, orange, mango, apricot, amaranth, spinach, leeks, rape, Capsella, garland chrysanthemum, yellow and green peppers and other vegetables and fruits rich in carotene, may appropriately eat This is not only beneficial to the prevention of lung cancer, hypertension, diabetes, dyslipidemia, coronary heart disease and other chronic diseases, there is a certain preventive effect.
    Studies have shown that selenium can improve immunity, inadequate selenium intake, will increase the risk of lung cancer. Shrimp, crab, lean meat, eggs, mushrooms, sesame seeds and other foods with higher levels of Se can be appropriate intake, but not too much animal food consumption, or not conducive to cardiovascular health.