The cost and calorie calculations are totally optional. If you choose to include them with your recipe, great, if not that's great too. I think it would be most helpful for the dinner recipes and not the dessert recipe. Obviously those aren't too healthy.
Also, if someone knows an easy way to calculate the cost of a meal, could you share? I'm having a hard time wrapping my mind around it. I mean, do I include the cost of a whole onion if I only use half of it in the recipe? If you know of a website that does this for you, please let us know.