But we don't even need to eat sweet fruits. If you look at your plate size as a constraint, then fruit carries an opportunity cost. You're adding sweet fruit in

But we don't even need to eat sweet fruits. If you look at your plate size as a constraint, then fruit carries an opportunity cost. You're adding sweet fruit in place of something else which could add more nutritional value in that same space. If you do eat fruit, then eat something which isn't sweet (tomato for example.)