Extraterrestrial Diets: Evidence, Energy Needs, and the Feasibility of Shared Nourishment

To the point

Even though Steven Spielberg's Disclosure Day stirred curiosity, there is no evidence aliens have visited Earth, and if they exist their diet would depend on their biology and size—carbon-based beings would need calories while post-biological ones would not eat at all.

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If aliens come to Earth, what would they eat?

Earth’s food would not necessarily be edible for them. Terrestrial protein might be of no use if their digestive systems used different amino acids. Our sugars might prove useless if their metabolism could not handle them. Our bacteria may devastate alien life – or perhaps not infect it at all.