Always drink a glass of water before eating fruit and an hour after to rinse the stomach of any traces of the fruit. Different fruits have different rates of digestion with bananas being the longest at about 45 minutes to an hour. I found that when I learned this about fruit, I was finally able to eat strawberries again. I used to get hives when I ate them, but by eating them properly, had no problems. This rule of proper fruit consumption is from the theory of natural hygiene which you could read about in many locations.
Enzymes are heat sensitive.
By processing foods, the enzymes are heated to extreme temperatures and are killed. This allows canned food to keep for years, but does us no good. The fiber in the raw foods also help to move the wastes out of our bodies. You may find that if you immediately increase the raw foods, you may become constipated or get the runs. Think of this as your body responding to changes and be happy with it.