It is uncountable.
Can you have 3 food? No.
The best way to check is to compare it to money and dollars.
Money is uncountable and dollars is countable.
I can have 3 dollars, but not 3 money.
Transport is both countable and uncountable as a noun.
countable
uncountable
Uncountable
"Paragraph" is a countable noun because it refers to a distinct unit of text in writing. You can have one paragraph, two paragraphs, three paragraphs, etc.
uncountable
"Bun" can be both countable and uncountable. For example, you can say "I bought five buns" or "I would like some bun with my soup."
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
Countable
few is countable
countable
The noun 'steel' is an uncountable (mass) noun, a word for a substance.