Muscle testing as a means to evaluate nutritional imbalances has come a long way in the 20 years. Science has caught up as well, verifying much of what practitioners of Complementary and Alternative Medicine (CAM) have known all along. Research has discovered many of the nutrients critical to neurological and immune system function. This knowledge means that if a doctor were to know which systems were out of balance, he could then use Functional Bio-Analysis (FBA) to discover which nutrients the body needed to restore balance, or homeostasis. This happens every day in the offices of FBA physicians.