I have joined a morning bootcamp in my town, and my instructor has stated to us campers that if we want to lose weight, to eat a piece of fruit with each meal. But, to make sure to stick with darker fruits such as different berries. If you are going to eat a banana, make sure to eat no more than either a 1/2 banana or one small banana a day due to the sugar content. Eating the fruit helps to keep to fill you up and keep you fuller longer.
One of my favorite breakfast is Oatmeal with a sliced banana and a packet of splenda. I NEVER thought I could ever eat oatmeal, let alone "plain" oatmeal, but with the splenda and the banana you would never know the difference! I actually look forward to the mornings that I get to eat my oatmeal!