According to the National Foot Health Assessment 2012 released in June, 78% of adults 21 and older have experienced one or more foot problems in their lives. This is due to the fact that flip flops provide little heel and structural support. In addition to that, they do not adsorb the pounding felt from asphalt and cement. It all starts with how your foot, more specifically your heel, strikes the ground. A thin layer of rubber is not sufficient in absorbing the shock, providing support, and protecting your feet. That is why doctors are now saying the wearing of flip-flops should be limited to when it is appropriate.