YOU SAID:

I want to go eat lunch.

INTO JAPANESE

私は昼食を食べに行きたい。

BACK INTO ENGLISH

I want to go for lunch.

INTO JAPANESE

私は昼食に行きたい。

BACK INTO ENGLISH

I want to go to lunch.

INTO JAPANESE

私は昼食に行きたい。

BACK INTO ENGLISH

I want to go to lunch.