题目：
A recently issued twenty-year study on headaches suffered by the residents of Mentia investigated the possible therapeutic effect of consuming salicylates. Salicylates are members of the same chemical family as aspirin， a medicine used to treat headaches. Although many foods are naturally rich in salicylates， food-processing companies also add salicylates to foods as preservatives. The twenty-year study found a correlation between the rise in the commercial use of salicylates and a steady decline in the average number of headaches reported by study participants. At the time when the study concluded， food-processing companies had just discovered that salicylates can also be used as flavor additives for foods， and， as a result， many companies plan to do so. Based on these study results， some health experts predict that residents of Mentia will suffer even fewer headaches in the future.
中文翻译：
最近一项20年关于M地区百姓头痛的研究正在探寻水杨酸的潜在治疗作用。水杨酸酯和用来治疗头痛的药物——阿司匹林是同一类化合物。尽管很多食品天然富含水杨酸酯，食品加工公司仍然在食品中加入它来作为防腐剂。这种水杨酸酯在商业上的使用被发现与我们为期20年研究的参加者所报告的头痛发病的平均数量下降是相关的。但研究结束时，食品加工公司却刚刚发现水杨酸酯也可以被用作食品香料， 因此很多公司准备这样添加。依据以上的研究，一些健康专家预期Mentia居患头痛症的数量将会持续稳步下降。
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