他们日常饮食蛋白质含量不足，因而身体虚弱。

They were weakened by a diet that was low in protein.

youdao

他们的日常饮食包括一块不新鲜的面包、一碗米饭，还有不新鲜的水。

Their daily diet consisted of a lump of stale bread, a bowl of rice, and stale water.

《柯林斯英汉双解大词典》

他们的日常饮食以蔬菜为主。

Their diet consists largely of vegetables.

《牛津词典》

So, their diet is a little bit of that-- some of their protein from that, then bread, olive oil, fruit, vegetables, cheese, milk, those kinds of things they can do.

因此他们日常饮食是一点点肉,一些肉质蛋白,然后是面包,橄榄油,水果,蔬菜,奶酪,牛奶,还有些他们可以生产的东西

耶鲁公开课 - 古希腊历史简介课程节选