1 Psychology thinks; Eating is sometimes a sign of anxiety. In other words, there may be some things that bother you in your real life, and you can't do it through hard work. For example, study problems, emotional problems, or relationship problems with parents and so on.
In real life, you may especially want to eat something, but this thing doesn't exist, so what appears in your dream is that you eat very hard.
The last possibility is to see a doctor to see if your body is missing any elements.
That's all, don't worry. Just let nature take its course.