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.
Humans are powered by an ecosystem that is powered by a fusion reactor.
Humanity’s power sources have been largely fossil fuels, stored by solar powered ecosystems eons ago.
Where do you think the energy in the fossil fuels came from?
? ^^^ ?
I’m going to eat exclusively life from geothermal vents just to prove you wrong.
Those vent city creatures don’t get out much.