YOU SAID:
my brother ate his food
INTO JAPANESE
私の弟は彼の食べ物を食べました
BACK INTO ENGLISH
My brother ate his food.
INTO JAPANESE
兄は食べ物を食べました。
BACK INTO ENGLISH
My brother ate food.
INTO JAPANESE
兄は食べ物を食べました。
BACK INTO ENGLISH
My brother ate food.
That didn't even make that much sense in English.