Why is the salt in the food incorrect?
If you called it "the salt" it would be incorrect because salt has no definite article here.
ahhh, so dumb of me, thank you!!
Is "there is salt in the food" wrong?
No, it's not wrong, and is in fact a far more natural translation of Tá salann sa bhia.
Why does salt in food not work?
You missed out the verb "is"