YOU SAID:

When I eat food, if it's not hot, I won't eat it.

INTO JAPANESE

食べるときは、暑くなければ食べない。

BACK INTO ENGLISH

When you eat, you must eat if it is not hot.

INTO JAPANESE

食べるときは、暑くないときは食べなければならない。

BACK INTO ENGLISH

When you eat, you must eat when it is not hot.

INTO JAPANESE

食べるときは、暑くないときに食べなければならない。

BACK INTO ENGLISH

When you eat, you must eat when it is not hot.