For those interested in an examination of current methods of food production, this is an excellent book: http://www.michaelpollan.com/indefense.php
Michael Pollan debates the role of nutritionism (how all foods can be broken down to its essential nutritional components and be fully understood) in the food production industry, and how it has lead to industrial processes which are not sustainable, and frankly, unhealthy.
Through the book he examines an industial meal (McD’s) and where all the components come from (largely corn and petrol), ideas of organics, a modern holistic farm, and a “hunter and gatherer” meal. In each he examines the sustainability, the root origins, and the impacts on society.
— just a quick correction – In Defense of Food was his other book – the one I review here (and highly recommend as it’s wonderfully written) was The Omnivore’s Dilemma.