YOU SAID:
I just eat peanuts all day long
INTO JAPANESE
私は一日中ピーナッツを食べるだけです
BACK INTO ENGLISH
I only eat peanuts all day
INTO JAPANESE
私は一日中ピーナッツしか食べません
BACK INTO ENGLISH
I only eat peanuts all day
That didn't even make that much sense in English.