What Do Xenomorphs EAT? (EXPLAINED)

Ah yes the mysterious question: do Xenomorphs eat? And by Xenomorph I mean XX121...

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Having done some research online, there seem to be 3 main theories, which are:
1)The Xenomorphs don’t eat, they don’t need to.
2)The Xenomorphs eat inorganic materials such as plastics and metals, as they are silicon based, but not humans…
3)They eat everything, inorganics and humans.
We know the Xenomorph from Alien must eat something, since it is a living creature, and one of the primary rules that apply to living creatures is, they need energy to live and grow. It is illogical to assume the alien Xenomorph does not eat ANYTHING, and yet can grow to over six feet tall, weighing at least two hundred pounds.

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