补钙须谨慎过量有风险_BEC初级作文

补钙须谨慎过量有风险

人体要吸收钙，还需要摄取充足的维生素D。药学研究所建议多数成年人每天摄入600国际单位的维生素D，并建议70岁以上的人每天摄入800国际单位，不过许多医生推荐的摄取量要大于这个数。从食物中摄入这么多的维生素D很难，而长时间阳光照射（维生素D的最佳来源）可能导致皮肤癌，因此专家称，许多人都应该服用维生素D补充剂。

Getting adequate calcium from food is easier. For example, 8 ounces of milk or 6 ounces of yogurt has 300 mg of calcium, and one cup of spinach has 270 mg. But studies show on average, Americans get only about 750 mg of calcium from their diets.

从食物中获取充足的钙则比较简单。比方说，八盎司牛奶或六盎司酸奶中含有300毫克钙，半品脱菠菜中含有270毫克钙。但研究显示，美国人平均只能从食物中获得约750毫克钙。

Many of the more than 30 million Americans who are lactose intolerant don't get

逾3,000万乳糖不耐受的美国人无法获得充足的钙，或者要依赖钙补充剂。

'For people who can't or won't get more in their diet, it's better to fill that gap with supplements than to stay on the low side,' says Bess Dawson-Hughes, director of the Bone Metabolism Laboratory at the USDA Nutrition Center at Tufts University. 塔夫茨大学(Tufts University)美国农业部营养中心(USDA Nutrition Center)