I recently read a great book about nutrition for adults called In Defense of Food: An Eater’s Manifesto by Michael Pollan. This is a quick read about the benefits of eating whole foods. Specifically Pollan recommends… “Eat Food. Not Too Much. Mostly Plants.” He is a proponent of buying local organic foods, making your own food instead of buying packaged stuff when possible, not buying packaged food with more than 5 ingredients (with some exceptions), and shopping the perimeter of the grocery store (produce, poultry/fish, dairy) and the bulk aisle. The only thing that bothered me about this book is that I wish the author was a registered dietitian or a doctor or someone in the field of nutrition (he’s a journalist). But my friend in the field says his book is well researched and documented. You should check it out.
Also, if you feed children, a book along the same lines is Disease Proof Your Child. The author of this book is a huge advocate of the vegetarian diet also, and is a little radical in his beliefs about how healthy children should be eating. While we are not radical by any means or vegetarian, I found some great ideas in this book for how to get my kids to eat a diversified collection of fruits, vegetables and whole grains.