求教关于argument40的 写作提纲 思路

yuandefeiyi

Milk and dairy products are rich in vitamin D and calcium—substances essential for building and maintaining bones. Many people therefore say that a diet rich in dairy products can help prevent osteoporosis， a disease that is linked to both environmental and genetic factors and that causes the bones to weaken significantly with age. But a long-term study of a large number of people found that those who 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 symptomatic of osteoporosis， this study result shows that a diet rich in dairy products may actually increase， rather than decrease， the risk of osteoporosis

这一题的 逻辑攻击点 在哪里呢？？

普渡哥

bone fractures are symptomatic of osteoporosis并不意味bone fractures are osteoporosis

longterm的研究有缺陷，bone fractures 可能是年龄增长引起的。

调差的具体跨度和数目应该说清楚。