If you like to "Food Journal" this is the best book ever on learning how the body uses food for fuel. If you read the book and truly understand the concept then losing weight is simply following the theory of "Eat Fat, Get Fat". When you calculate how many of your daily calories actully come from the fat in the food you eat, you will be shocked and then will wonder why American aren't even more over-weight. It taught me a way of eating that I can live with the rest of my life.