Human survival without eating

In this question, the most "realistic" idea is to have the human have an oxygen tank strapped to his back and connected to his nose at all times (preferably through a mask of some sort). However, this has the problem of having to remove it to eat.

~~Probably this exists already and I'm not aware of it (hence the "reality-check" tag),~~ but is there any way to remove from a human being its necessity to eat~~, like feeding him intravenously~~?

Edit: OK, let's change the question a bit: is there a way to, yet again, change the human being into remove the necessity to eat altogether?

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Human survival without eating

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