Unlike Spanish and Portuguese, in French you have to use the pronoun. In French, when said out loud, the je, tu, il/elle/on, and ils/elles conjugations are pronounced the same, so you need the pronoun to differentiate.
"You eat a tomato and some fruits" isn't good English, at least not in the way it's used here. You could say, "You eat a tomato and some fruit," and the next thing you know, you turn orange. But that's not the sense here. Also, we would say "some fruit," not "fruits."