Exos are just robots with the memories of humans, the memories of their past life.
It's very unlikely that exos can eat. Cayde just probably has memories of food.
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They have to be able to eat or else why would cayde say I just ate after failsafe says something gros during the strike exodus crash
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Wrong. https://www.bungie.net/en/Forum/Post/227763711/0/0
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Exos are not just robots.. Think of like Ghost in the shell.. They place their full consciousness inside of a machine, and an exo can not function without one.
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But we saw in the Last Call teaser of D2 Cayde pour himself a drink and even says he had the intention of drinking it. Was he just doing it for the hell of it?