I see related question such as: <p>
[Does Superman need to breather][1]
and
[Bruce Banner needs to eat, but does the Hulk?][2]

But does Superman need to eat?   Is yes, what happens if he doesn't?

  [1]: http://scifi.stackexchange.com/questions/34440/does-superman-need-to-breathe
  [2]: http://scifi.stackexchange.com/questions/12947/bruce-banner-needs-to-eat-but-does-the-hulk