The stardust is a given. As for sunlight, all the energy including somewhat arguably geothermal (using the suns gravity to help form the earth and I guess radioactive material being formed by other stars) comes from the sun and gets converted into chemical energy you eat so you’re stardust animated by sunlight (mainly).
All of humanity is powered by a massive fusion reactor.
I’m going to eat exclusively life from geothermal vents just to prove you wrong.