My cat eats A LOT!!!!!

[I love my Cat]

Hi! My cat, Misty eats A LOT! We go through about 2 1/2 cans of cat food a day! Is this normal? When she wakes up, finishes playing, and when she gets off my lap she goes to eat! She is not fat though. Does anybody else's cat do this? Please tell me! Could she be pregnant???