This book is by far one of the most powerful and important books I have every read in my entire life. It is my opinion that it should be required reading for everyone before they are allowed to graduate from high school. Everyone who eats food needs to read this book.
Here is the link to the free PDF version.
The Vegetarian Myth by Lierre Keith
If you need more convincing, please read:
Eat Meat. Drink Water. 