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病因 光照不足:人体所含的7—脱氢胆固醇经紫外线照射后可转变为维生素D_3。皮肤接受阳光中紫外线不足,内源性维生素D合成减少可导致佝偻病的发生。影响日光照射的主要因素有地域、季节、空气污染、居室采光不足及户外活动时间短等因素。 摄入或吸收不良:含维生素D的食物摄入不足或吸收不良也可造成佝偻病。实验证明,母乳中维生素D含量很少,远不能满足小儿日常生长发育需要,若晒太阳不充足或不注意补充维生素D,婴儿就易患佝偻病。
Causes of insufficient light: the human body contains 7 - dehydrocholesterol UV irradiation can be converted to vitamin D_3. The skin suffers from inadequate UV rays in the sun and reduced endogenous vitamin D synthesis can cause rickets. The main factors affecting the sunlight are geographical, seasonal, air pollution, lack of living room lighting and outdoor activities such as short time and other factors. Ingestion or malabsorption: Inadequate or poorly absorbed foods containing vitamin D can also cause rickets. Experiments show that the content of vitamin D in breast milk is very small, far from meeting the needs of children’s daily growth and development, if the sun is not sufficient or do not pay attention to vitamin D supplementation, the baby is susceptible to rickets.