I completely agree with the idea that healthy food come from nature, whereas bad ones are man made. That's a good rule to follow. I'm sorry for not referencing who said it... this post was long.
I think it's also important to think about the idea of letting our bodies tell us when they need and when they need it. It is in fact how the rest of Earth's creatures survive, and we have stopped using our bodies and their signals to help us eat properly. It's hard because food is readily available, so the messages don't seem as useful to us and we ignore them. But, I find if I may attention I'll notice my body craving something in particular, such as meat (i.e. my body is in need of protein or some amino acid that I'm running low on) or milk (must be needing some calcium).
We all eat so much and so many different things that it's no wonder our bodies rarely get a chance to communicate to us. Anyway, in my opinion fruit is good for you. I eat three piece of fruit a day, one with each meal. I eat at least as many servings of vegetables and other things like protein. So, I think balance and moderation is important, but eat natural and listen to your body!