"The mouse tries to grab the food."
Translation:Mus cibos captat.
Cibum is not an uncountable noun in Latin. So the plural won't mean that you have several kind of food, but the meaning is rather "dishes" when using the plural, and "food" when using the singular.
But, in many examples, with Latin sentences from the literature, they seem to use either the singular or the plural, to mean "food".