This is more of a listen than a read, but a fascinating look at the ecosystem which is your stomach. It makes the point that you should look at your insides as their own world. Here the thought is brought up that as much as you should not dump trash in our oceans, nor should you deposit it in your body.
This had a profound impact on my already strict diet and made me consider even the smallest vices I had with regards to food.
This is done by Tim Ferris, author of the 4-Hour Body/Chef/Workweek. Highly suggested reads depending on where you find yourself in life. He also conducts over 100 interviews and nearly 600 blog posts on his website. http://www.fourhourblog.com I suggest subscribing.