Hey, BlueEyes.
One thing I noticed about your original post--the menu you describe (Cheerios, banana, sandwich, brown rice) derives a lot of its calories from carbs. If you're having issues with hunger still, you may want to consider adding more protein and healthy fat to your meals.
Every body is different; some people thrive on low-fat, high-carb plans while others find carbs just make them hungrier in the long run. Sometimes it takes a little trial and error to find out which proportions work well for you.
I'm a calorie-counter and don't do well on low-carb or low-fat. For me, what works best is incorporating a little of at least two and preferably all three types of foods in my meals. An apple won't fill me up, but an apple
and a cheese stick will. Cereal with skim milk for breakfast leaves me hungry an hour later, but cereal with whole milk works. My salads always include meat, cheese, and/or nuts to supply fat and protein along with the fiber and carbohydrate; without those things mixed in, a salad will paradoxically leave me hungrier than no food at all.
It's all a matter of trial and error. The good news is that the worst that can happen is you discover that some staples don't work for you and need to be replaced. The best that can happen is that you find things that make all of this vastly easier.
Congratulations on your first three pounds!
May they be followed soon by all their unwanted brethren.