argu34

34.Milk and dairy products are rich in vitamin D and calcium, substances
essential for building and maintaining bones. Many people therefore
believe that a diet rich in dairy products can help prevent osteoporosis,
a disease in which the bones weaken significantly with age and that is
linked to both environmental and genetic factors. But a long-term study of
a large number of people has found that those who have consistently
consumed dairy products throughout the years of the study have a higher
rate of bone fractures than any other participants in the study. Since
bone fractures are a symptom of osteoporosis, this study result shows that
a diet rich in dairy products may actually increase, rather than decrease,
the risk of osteoporosis.

牛奶和奶制品富含维生素D和钙，这是骨骼生长和维持所必须的物质。因此很多人相信多吃奶制品的饮食可以帮助预防骨质疏松症，这是一种骨骼随年龄而显著弱化而且与环境和基因因素相关联的疾病。但是一项对大量人群的长期研究发现那些在研究期间经常食用奶制品的人骨折发病率比其他参加研究的人要高。由于骨折是骨质疏松症的症状之一，这一研究结果表明富含奶制品的饮食实际上会增加而不是减少患骨质疏松症的危险。

1.多吃奶制品的饮食不一定能够帮助预防骨质疏松症，有可能奶制品中还有其他的一些元素能够更大程度的加大骨质疏松症的概率。

2.survey中没有清楚的给出对比人群的特点，如年龄，身体状况等等。有可能那些经常使用奶制品的人本身是由于其他的原因如遗传因素等菜导致的骨折。

3.即便是因为奶制品导致的骨折症状，但是有骨折并不代表就是骨质疏松症。也有可能是其他的病症。