Just came back from the library with and then spent about two hours reading and perusing:

What I Eat: Around the World in 80 Diets by Peter Menzel and Faith D'Alusia.

From the 800 calorie diet of the Maasai herder to a 12,300 C diet of a British "Snacker Mom", this is a trip around the world, peeks into the lives of an incredible variety of people, what they eat and how they live. Wonderful photos and some interesting essays, including The Pleasures of Eating by the wonderful Wendell Berry. In large format - must weigh over five pounds!

While not a "dieting" book, it is full of ideas about different healthy and interesting things to eat. I was so busy looking at it, I did not stop to eat.