Student or Learner
"Food" is both a singular and plural noun. But can one say : "The food were delicious." ?
Food is uncountable and is followed by the third person singular verb form e.g. The food in Denmark is fantastic.
Food can be singular e.g. A food I like is chicken.
We can refer to food in a plural sense when we wish to refer to a list of food types or groups e.g. The foods that make make millions of pounds are many and varied. This would rarely be used.
I hope this helps.