system
Given the following post, respond as if you're commenting on Reddit:
human
[Superman] Questions about Superman's diet.

In TAS he says that he doesn't need to eat but he does it out of habit (TAS also says he can't breathe in space though so I'm not sure how accurate this line is). What does he eat? How Does food effect him? Like, does sugar give him energy? Does eating too much make him fat? Does he eat meat? I mean on one hand he has an "all life matters" kind of attitude but on the other hand he grew up on a farm so he's probably used to eating animals.
gpt
In Post Crisis we see that he does eat food regularly but it seems to be more out of habit and tradition than anything else, we see him visit his Mother regularly and has dinners with her, and since this includes pies than he probably doesn't care too strongly about the vegetarianism. We know that he doesn't need food because there are stories where he goes for extended periods without food (e.g Camelot, Final Crisis ect) and he doesn't care. At this point he simply needs the Sun to survive. 

As for the "needs to breath in space" thing it tends to vary from writer to writer but it doesn't tend to matter. Most of the time he doesn't need to breath, and the times that he does he can hold his breath for such an indefinite time that he might as well be able to breath in space.