From a conventional medical perspective, the cause of ADD/ADHD is unknown. Some factors have been identified, however, that may play a role in ADD/ADHD:
From a naturopathic medical perspective, however, there are other dietary/nutritional factors that can contribute to ADD/ADHD. While research on these factors has been mixed (probably because each of them only affects a subset, rather than all, kids with ADD/ADHD), in my experience most kids and adults with ADD/ADHD will improve when these factors are addressed. These factors are as follows:
ADD/ADHD, like most conditions, is multi-factorial. In any given person, a variety of factors will add up to cause the ADD/ADHD. When enough of those factors are present (when a certain threshold is exceeded), the person experiences ADD/ADHD. To prevent the ADD/ADHD, all of the factors don’t generally need to be addressed, just enough of the factors to take the person below this threshold.