1.通常为不可数名词。如：
We are out of food. 我们食物吃完了。
These plants are used for food. 这些是食用植物。
Do you like Chinese food? 你对中国菜有兴趣吗?
Good food keeps you healthy. 好的饮食使你健康。
About 90 percent of most food is water. 大部分食物中约有90%为水。
Increase in population caused a shortage of food. 人口增加导致食品短缺。
2.若表示某种特殊种类的食物，则可用作可数名词。如：
Don’t eat too many dairy foods. 不要吃太多的奶制品。
Why don’t you eat those healthful foods? 你为什么不吃那些有益于健康的食物?
My doctor told me to avoid fatty foods such as bacon or hamburgers. 我的医生叫我避免吃油腻的食物，如咸肉或汉堡包。
