We tend to think that if we eat we will over do it and become unhealthy. It really is how and what you eat. If you were to eat breakfast and healthy snacks you would be fine till dinner. You don't have to eat big helpings just try and eat little snacks that are good for you.
Your gorowing up, sometimes when your at a teenage age, it makes you more hungry, everything is growing in your body. You might be more active lately, the more energy you waste them more food you need to supply that.
you haven't been eating enough?
pregnant or something?
too many bubbles!