You could try the 'placebo effect' by using a smaller plate. This means that it will still look full whilst containing less.

Eat more fruit, vegetables and oatmeal for breakfast.
And go in for sport, of course!
"A sound mind in a sound body" - English saying.

I don't mean to sound like a commercial, but Activia works really well for me. Everything flows, you know.

not any specific type of food can reduce the amount of fat in your stomach, it doesn't quite work that way.

Losing fat in a certain spot isn't possible.  You lose fat where your body decides to take it off, and the stomach is usually the last place. 

To lose weight you need to eat less calories than your body uses in a day, and some foods of course can be good at doing that, moreso than others.  Eating lean meats and veggies will definitely help.  Stay away from complex carbs and fats.

Fruits and vegetables, lessen carbs.

In my honest opinion, i don't think that the ammount of food will assure a flat stomach. My wife is on a very strict diet, but if she does not put in some work in exercises it doesn't matter how strict the diet is. I personally bike a lot. I can have all that P's (pasta, pizza. potatoes etc.) i want and still have a flat stomach. Just put in some effort and keep doing exercises on a regular base.

I didn't realise that sugar was worse than fat. Why is this?

Ok so the body stores sugar as fat but if you eat fatty foods does the body not store any of the fat contained in them?