Think of your body as a machine, if you give a car cheat gas, it isn't going to run smooth for very long. By giving your body processed food, you're giving your body fuel it cannot use. Therefore it's only a matter of time before it breaks down, and causes illnesses. If you chose to eat white bread, rice, or flour, just think of this, that stuff sticks to your intestine like glue, then clogs up your intestine and makes it hard for other foods to move through there, also it causes foods to rot inside your body causing parasites to grow. Just something to think about the next you go to do your groceries.