Stop consuming sugar and caffeine. Fruits are a great suppliment until your body adjusts. You cannot have an abundance of attention without the fuel to power it. - It was one of the hardest things for me to do.
I second this. Sugar does much more harm to our body than we usually realize. After stopping sugar, my health tremendously improved. But the first few weeks and months of stopping sugar, (I used to consume too much sugar earlier) I noticed the worst possible games my mind can play against me. My mind used to say that it is ridiculous and I am being impractical, childish and what not!. It was a war and I won it. And now I am reaping the benefits. I am able to focus better. I am having better energy and my memory has improved.
Fruits also contain a lot of hard-to-digest fibers. Both the fructose and the fibers taken together are fine.
It's when you refine the fruit (e.g. juice it) that you separate the fiber away and therefore loose the counterbalance. The fiber and relative inconvenience in consuming the fruit also help to regulate the intake. Contrast a tall glass of orange juice, which is about 4-5 oranges minus their fiber, with manually pealing and eating that same number of oranges. One can be gulped under a minute, or maybe a few minutes if you drink it slowly, the other will take quite a while to eat and leave you with a feeling of being full.
That's why if I'm offered juice, I try to sip it slowly.
Not sure if satire or not, but plenty of naturally occuring things which existed for millions of years are bad for human beings. Poisonous plants for are an example.