I remember this movie very vaguely, but I think it was a teen that had a suit of some kind and fought off monsters. He had blades that came out of his elbows I think. There was a scene where he want to get a hamburger, and the suit I tihnk ate it, and the kid inside recieved the hamburger all mashed up in a ball for him to eat.
Something like that.
The blades from the elbows is indeed from "The Guyver", but I think the suit eating the hamburger and giving the kid a ball of mush is from "Star Kid". You may have the two movies mixed up/combined in your memory.http://www.imdb.com/title/tt0120478/
The bit about the rechewed hamburger made me think of "Star Kid" as well. In that movie there's also a scene where he really needs to go to the bathroom, and I think it is his teacher who helps him get the suit open so that he can go.