尽管许多食品天然富含水杨酸盐，但在过去几十年里，食品加工公司也一直在食品中添加水杨酸盐作为防腐剂。
Although many foods are naturally rich in salicylates, for the past several decades, food-processing companies have also been adding salicylates to foods as preservatives.
我们最初在2016年就有了这种怀疑，让我们感到困惑的事实是，当时国家统计数据显示，卡路里的消耗量在过去几十年里急剧下降。
We originally had this suspicion back in 2016, puzzled by the fact that national statistics showed calorie consumption falling dramatically over past decades.
在过去几十年里，畜牧业变化巨大。
There have been many changes in the livestock industry in the preceding decades.
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