YOU SAID:

I'm just here for the food.

INTO JAPANESE

私は食べ物のためだけにここにいます。

BACK INTO ENGLISH

I am here only for food.

INTO JAPANESE

ここにいるのは食べ物だけです。

BACK INTO ENGLISH

Only food is here.

INTO JAPANESE

食べ物だけがここにあります。

BACK INTO ENGLISH

Only food is here.