I can tell you, fruit is the best source of natural sugar and it is packed with vitamins which top any other food. That's great in itself, but fruits are even more than than, they have anti-oxidants, fruits are pre-digested also, making it easier for your stomach to digest. Fruits also have a lot of water, and you know how important water is, right?
Fruits are wonderful- Oh wait, I'm not done yet, fruits also have fibers, necessary for good digestion. Fruits are really wonderful, aren't they? They've been around far more than humans have, and before the whole post-processed food era, fruits were the only sweet thing, why were they sweet? Our sweet sense developed for the sole purpose of eating sugars, which gives our bodies energy, fruits have sugars, and that's why they're sweet.

Fruit is alkanine forming. Meaning it's ready to eat with no need of post-processing. Let me ask you something now, since fruits are really really sweet, aren't they bad for you teeth? Maybe all athletes have bad teeth? Think about it, maybe look up what I wrote before. Nothing yet? Okay, I'll let you in on it, fruits do have a lot of sugar, but since water and fibers come along with the sugars, they clean your mouth while you're eating fruits. That's pretty cool, right? Fruit can damage your teeth though, dried fruit, specifically. Dried food has no water, obviously, that's why it's dry, right? Which means that it'll stick to your teeth and gums, which ofcourse will greatly increase the chance of tooth decay.
Acids in fruits can also have an effect on your teeth and encourage enamel erosion and the decay of your teeth, those would be the citrus and not fully riped fruits. If you're having trouble with your teeth, I suggest you rinse your mouth with water after eating those kinds of fruits.
Another thing fruits are amazing for is.. Diabetics can eat it. Fruit does not cause diabetes, diabetes is caused by high-fat foods and possibly some genetics, which will give you insulin sensitivity.
Let's talk about potassium too, bananas. There's a big difference between artificial potassium, and the naturally occuring one. Usually a supplement is not allowed to have more than 99 mg. of potassium, if you had 200 mg of artificial potassium, you'd be in the hospital, or, not, if you live alone. But just three bananas.. Guess. You didn't guess right. They have 1,200mg of potassium. That sounds so deadly, right? Shouldn't bananas be illegal? Well, no. As I said, there's a big difference between artificial and naturally occuring potassium, I see a lot of people scared of the potassium in bananas, don't be afraid, eat away!
I hope this broadened your view on fruits. They trully are wonderful, older than humans foods.