Has anyone read a book by Felicity lawrence titled "Not on the label: what really goes into the food on your plate"? Theres some scary shit in there, the foundation of the book is focussed on the industrialisation of food - gangmasters exploiting farm-hands, the big supermarkets only paying a fraction of what was promised to farmers, the importation of vegetables from developing countries when the same vegetables are being thrown out in the country of import etc.
She discusses how, because there is no tax on aviation fuel, England and Europe are going as far to sending their salad vegetables to Africa, where they exploit the workers to convert the vegetables into salad, packaging it and then flying it back to Europe - it's worse for the environment, worse for european farmers, exploits and underpays workers in developing countries, but it is CHEAPER!
Also, because of all the subsidies on maize and soy (primarily by the US and Europe), these crops are being produced in excess. This excess food is dumped on developing countries for less than production cost and are making it impossible for local farmers to compete. Also, the overabundance of this food is causing the adulteration of food to a greater extent than ever before - modified starches and soy oil are being added to 2/3 of the fast foods and, because they are very low in nutritional value and high in fats (and not the good ones!), not only is this making us more unhealthy, but it decreases the prices of junk food and makes it a cheaper than healthy foods, forcing the poor into an unhealthy eating pattern.
If you can get your hands on this book at the library, then give it a read - I guarantee it will open up your eyes!