Endogenous is defined by the online dictionary, as having an internal cause or origin, as well as growing or originating from within an organism. On the other hand, exogenous is defined as having an external cause or origin and/or developing outside an organism. Another simpler way to say this is that what occurs within (chemically) is endogenous and what is outside (environmental factors) is .
exogenous. For example, in a person who suffers from obesity, the cause may be that he or she eats too much or it may be a glandular problem. If the obesity is the result of excessive eating, one would say that it is an exogenous factor. If the problem is glandular, however, it would is considered endogenous, because the glands are within the human body. More Reference Links: http://www.dr-bob.org/babble/20020124/msgs/91465.html http://aids-daily-living.medical-supplies-equipment-company.com/obesity-info-bariatric-equipment.htm
