Throughout the game Cayde makes it clear that exos can eat and drink, does this mean that they still have a human digestive track? Where does it all go and is it even necessary for an exo to eat, can they get drunk?
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It's possible that the Exo run on a form of nanotechnology similar to what some scientists call "grey goo." It's essentially a dense swarm of nanobots that require organic material to replicate and function. This would explain the Exo's need for food, but not the drinking part (unless said drink was some kind of organic sludge used as fuel).