两种都可以，但必须看前面或句意怎么用而定。
可以+ s 复数：
例如：How many different kinds of foods can you hear him say?
你能听出他说的多少不同种类的食物吗？
不可数的单数时：
例如：You should eat different kinds of food in order to keep a good health.你可以通过吃多种食物保持健康。
There were different kinds of food, such as vegetables and some meat. 做了好几种，比如蔬菜和肉。
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