The answer is Binge Eating Disorder
True, due to there remote lifestyle, they rely on more primitive ways and use of medicine, those that are less affective and more herbal. Although, if a tribe is willing to venture to a city or civilized population to seek care they can receive medical care, it depends on how they would like to handle the situation.
an organ system is a group of organs that work together for a common function. the order goes cells, tissues, organs, organ systems, organism.