There is no reason they should limit how much vitamin you take, any more than they can limit how much water you drink.
1、 they should limit how much vitamin you take 是定语从句吧 修饰先行词reason 那么省略的that在从句中做谁的宾语
2、not....any more than是固定搭配 但是句中为什么没有not呢
第二个问题
Any more than是个惯用短语,表示的是之前的那个说法is not any more true than第二个说法
[X] is not any more true than [Y]
意思就是两个说法都是一样不靠谱的不应该有reason的
1、There is no reason (why) they should limit how much vitamin you take 省略了 why 对吗
追答why不可能省略的,这不是定从,是同位语从句。I heard the news that our team had won.
追问好 那如果是同位语从句 that也能省略?
追答有道理,不能。