How do the shoes you wear affect your posture?

Now that the holiday season is upon us, many of us females like to wear shoes that accessorize our clothes rather than shoes that fit well and are practical.   Our posture is altered by the shoes we wear.    We have normal curvatures of our spine.  Our posterior neck and lower back curve inward slightly while our mid back curves outward as seen in the picture below, but look what happens to our curves when high heels are worn.