What you are saying seems to have a little bit to do with the "Volumetric" principles (google for more info). Yes, it is true, if you eat foods high in volume, but low in calories, you will feel full, but you also need to give your body the nutrients it needs, otherwise, no matter how full your stomach feels, your metabolism will be out of whack.
In other words, you can use the principle of low caloric density foods in combination with some healthy lean proteins, whole grains and healthy fats. This will give you enough nutrients and keep you satisfied.
Another thing – you said that you can eat as much fruit as you can, keep in mind that fruit, though healthier that French fries, still has calories. If you really stuff your self with fruit, you are not exactly getting away calorie free. For example a medium-large size banana has about 100 calories. I can eat about 4-5 of those if I was trying to stuff my self, but that would give me 400-500 calories, which is about the same as a good size healthy meal. So you might as well eat a balanced meal full of veggies and fruit for desert. You will achieve the same result calorie-wise and your body will get the other nutrients besides what it gets from fruit.
I hope this helps. One more thing – there is no such thing as a dumb question. Ask away whatever comes to your mind. Remember – we’re all in this together.