Food is usually uncountable but it can also be countable. When talking about the general concept of food, it is uncountable. e.g. "I ate a lot of food yesterday." It is countable when talking about different, distinct 'types of' food. e.g. "I ate many different foods when I visited India." [I ate many different types of food..] or "Lots of the foods he eats are high in fat." There are lots of nouns like this. When an uncountable is used as a countable noun, it is usually because you are talking about distinct examples, such as types/kinds of. Coffee is uncountable, but we can say: "I had two coffees this morning." - [I had two [cups of] coffee this morning.]

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Food is uncountable