Blog Challenge Day 3 - A favorite book

Having to pick just one favorite book when I read many a month is brutal.  Since I frequently review books here on the blog, I think you probably know by well what kinds of books I read.  But, pick one I will.  My favorite book - based on how much it impacted my life - is "In Defense of Food" by Michael Pollan.  This was the second I read from Pollan and together they literally changed my life.  Does it surprise you that my pick for this category comes in the form of non-fiction?