For example, if I were looking at the fruitarian diet, I would be critical of the fact that it's very unlikely that we were eating primarily fruit in prehistoric times considering our guts shrank as our brain got bigger.
例如,我认在史前时期采用水果饮食肯定是行不通的,因在那个时候,人类的消化道比较短,而大脑相对较大。