现在人们很重视孩子的营养,但佝偻病的发病率仍相当高,特别是城市更为多见。这是为什么呢? 佝偻病主要为钙、磷、维生素D摄入不足引起的。维生素D从食物中摄取量较少,主要靠皮肤接受紫外线后自身合成。据研究,城市居民由于在室内时间久,即使在室外活动,也因高楼林立,街道两旁大树遮荫,接受阳光照射时间少,再加上大气污染,空气中灰尘、 Now people attach great importance to children’s nutrition, but the incidence of rickets is still very high, especially in cities is more common. Why is this? Rickets is mainly caused by inadequate intake of calcium, phosphorus and vitamin D. Vitamin D intake from the food less, mainly by the skin after its own synthesis of ultraviolet light. According to the study, urban residents in the room for a long time, even in outdoor activities, but also because of tall buildings, trees shade the streets, to accept less sun exposure, coupled with air pollution, dust in the air,