Why is allostasis better than homeostasis for explaining the…

Why is allostasis better than homeostasis for explaining the influence of stress (as defined in class) on physiology and disease?  In this answer you should define stress (holistic medicine definition), allostasis and homeostasis.  In addition, you should discuss specific principles of allostasis that (in contrast to homeostasis) are better at describing the consequences of stress (reframe from just list the principles of allostasis).