This is a topic that gets very popular when talking about going to any country that's different from what you're so used to. Food is one of the greatest things we enjoy in life (at least I do), and when you throw yourself into a new environment that is not your own the biggest question you have for yourself is"how will I survive?" (a.k.a "what will I eat?"). In regards to traveling to Japan and living in America, it may seem like a necessary concern. What will you be able to eat in Japan? They seem to like their food raw and fresh, like just jumped out the water "fresh."
I'm here to reassure you that you will be just fine in Japan when it comes to food. There is something for everyone.