Yeah I know I reviewed already but I just thought I'd mention that Clark's appetite is the same as everybody else's. but yeah anyways bye.
Depends on which cannon you follow. Since they never provided us with this information in the movie I took some creative license. For more information on all the possible interpretations of Clark's character and how his body works please look up Smallville, and all the various and sunder DC incarnations of him. Thank you for commenting.