richfood是不是可数名词

例句：

Enjoy your food.

用餐愉快。

It's not like you to be off your food.

胃口不好，这可不像你了。

Developments in your career may give you food for thought.

事业上的发展可能会引发你很多的思考。

Supplies of food and medicines are inadequate

食物和药品供应不足。