In the anime when dedede kills whispy woods, they can only revive them with one of his apples. So kirby ate a lot of apples so he searches for whispys. You just see him in a different dimension. He needs another demension for all the food HE eats.
there is another episode where whatever happens to a Dee Dee Dee piggy bank happens to King Dee Dee Dee and kirby swallows it at the end and Kirby's stomach is endless and i think Kirby (209?) has the best answer see look at this video... 1:27 to skip opening and 1:49 to stop the discusting ketchup scene
On an episode of Kirby: Right Back at Ya! (I forgot which one it is) Kirby inhales a voodoo doll (or however it's spelled) of King Dedede, and it shows King Dedede in another dimension, and on episode 6, on one part, it says something about stuff that Kirby eats going to another dimension.