It is very important to remember that whole wheat flour is different from white flour in a few different ways. Often, whole wheat flour can be used instead of white flour with little or no consequence, but it will behave differently throughout the course of the recipe.
1) Whole wheat flour absorbs liquid more slowly than white flour - you must give the flour a few minutes to soak up the liquid, or even add an additional tablespoon of liquid.
2) Whole wheat flour is more dense than white flour. While you can make your cakes with whole wheat flour, you shouldn't expect to have the same results as using white flour.
3) When making breads with whole wheat flour it is important to allow your dough to rise to at least double the volume. This can take 1 1/2 to 2 hours - so be patient! (It will be worth it)
Remember to consider what you are baking when you make the decision to sub in whole wheat flour: Cakes, pastries and other delicate goods are known for their light and airy textures. Try using whole grain pastry flour, but remember that it will taste different than white flour! Generally, I have found that you can use whole wheat flour in the following baked goods with little or no difference in the final product:
~ Muffins
~ Banana/Zucchini/Carrot Breads and cakes
~ Bread (as long as you knead the dough for longer, and allow it to fully rise)
~ Cookies, especially ones containing oats, bran, coconut, etc.
There are other goods that you may want to consider using half white flour and half whole wheat, such as:
~ Pancakes
~ Baking powder biscuits
~ Cinnamon buns and other "fluffy" bread products
With a few things in mind, you can easily use whole wheat flour in place of white flour. Sometimes you need to experiment in order to eat healthy food - but in the end it is always worth it when you can make your cake and eat it too ~ with no guilt! We all do what we can when it comes to making better choices, and using whole wheat flour - or other flours - is a great way to start!
*For anyone out there wondering about gluten-free flours, I am in the experimental stages of this myself, and I will be sure to keep you updated!