What Would Extraterrestrials Eat on Earth? Diets, Digestion, and the Fermi Paradox.

To the point

Aliens would likely not subsist on ordinary Earth foods but would rely on their own digestive systems and Earth’s raw materials or energy, with calorie needs varying by size, toxins and microbes posing risks that experts like José Miguel Soriano del Castillo would assess, and some futurists suggesting post‑biological, electricity‑based diets, all within broader questions about life beyond Earth touched on by Brian Cox’s discussions of the Fermi Paradox.