Appetite in second trimester

I am at week 15. The appetite grew quite suddenly 2 weeks ago. I have been hungry so often. What I do is to control my intake by breaking up the meals. I have a light meal every 2 hrs. Eg: peanut butter sandwich, few spoonfuls of fried rice, 2 slices of pizza, yogurt with blueberries, glass of soy milk. When I spread them across the day, I can keep eating while making sure I am not overeating. Takes a lot of discipline thou.