If you haven't heard yet, it's been revealed that the "natural" vanilla flavoring in many processed foods is derived from the anal glands of beavers. Why didn't you know this, you ask? It's because food makers do their best to disguise the ingredients they use that they know would keep you from buying their food. They skate on a thin line, constantly cutting costs by replacing real food ingredients with chemical or less appetizing ones and hoping that you won't find out.
Many diet foods that are supposed to help you lose weight contain neurotoxins that stimulate your appetite. In this age of greater health consciousness, there are still, astonishingly, popular foods on the market that contain health-destroying substances like petroleum-based products (Twinkies, for example). Crisco is still on supermarket shelves. Some food contains hormones that can stimulate your system to support cancer cells. Some, like dairy, beef, and chicken, contain antibiotics that can produce antibiotic-resistant strains of bacteria. Eating processed food is like navigating a mine field, especially since many ingredients have "acceptable" names that disguise what they really are. Brown rice syrup, for example, sounds wholesome, but it is a neurotoxin that stimulates appetite, and it is only "natural" in the sense that it originally came from brown rice; it's actually highly processed.
Most people probably don't want to eat a 100% raw diet, and some authorities suggest that there are reasons not to. But eating more raw, organic fruits and vegetables will reduce your exposure to the hidden dangers in processed food, and that's a smart move.