Answer:
He eats food, doesn't he?
Step-by-step explanation:
Tag questions are used to turn statements into questions. We use them to check the information we think may be true.
They are formed by using an auxiliary verb (e.g. be or have) and a subject pronoun (e.g. I, we, they). The auxiliary verb we will use in this sentence is be, and the pronoun we will use is he, because that is the subject of the original statement.
If the original statement is positive, the tag question is negative, and the other way around. Because the statement He eats food is positive, the tag question will be negative. That's how we will get the question:
He eats food, doesn't he?