Is it good to just eat fruit for breakfast?

There simply isn't enough to give you energy for the day, and it's not healthy in the long run. You can substitute eggs one day, make scrambled eggs with diced tomatoes, or have a hard boiled egg with fruit, have your banana and cereal one day (I do Corn Flakes + sliced banana + honey), and you can have yogurt with fruit, too. But simply just fruit all morning till lunch isn't healthy enough in the long run. Also, you can get protein from oatmeal-whole grain bread with peanut butter sometimes & have fruit on the side.