Maintenance calorie needs

You teach that when I’m trying to lose weight, I’m training my body to consume my fat for energy. When (I’m still a ways away) I reach my ideal weight, presumably, I should not be using my body’s excess fat stores any more since there is no excess fat.

If I still follow intermittent fasting at my ideal weight, where does the body get the needed energy from? Would I need to increase my food consumption then to provide the necessary energy?