YOU SAID:
i want to eat lunch right now
INTO JAPANESE
今お昼ご飯を食べたい
BACK INTO ENGLISH
I want to eat lunch now
INTO JAPANESE
私は今昼食を食べたいです
BACK INTO ENGLISH
I want to have lunch now
INTO JAPANESE
私は今昼食を食べたいです
BACK INTO ENGLISH
I want to have lunch now
That didn't even make that much sense in English.