The noun food is an uncountable and a countable noun, depending on use.
The noun food and some of the words for food, such as rice, sugar, butter, or meat are words for substances, uncountable nouns. Multiples of substance nouns are expressed in quantities such as some food, a lot of food; a little sugar, a cup of sugar, a bowl of rice, a stick of butter, etc.
The plural form for substance nouns for food are reserved for 'types of' or 'kinds of', for example:
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Countable
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Shark is a countable noun.
countable
Countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Pasta is a countable noun
Countable
The word 'violence' is an uncountable noun.
The gerund painting is a countable noun, as in "There are 12 paintings in this room."