I am big on knowing what is in my food. This doesn't mean that I never eat junk. But when I do, I want it to be a conscious choice, not an accident. Unfortunately, many food companies engage in deceptive practices that make it very easy to get fooled if you don't read the labels and, even if you do study the labels, it can still be hard to know what you are eating.
This video talks about some of those issues and more and is well-worth watching: