Present one theory or model within the field of public

 Present one theory or model within the field of public health which describes either how people maintain health and/or how illness is caused? Presentation of the theory or model may be submitted in graphic or narrative format. Even if this is not your personal viewpoint/belief, how can these multiple theories and models be beneficial to public health professionals? It is not appropriate to repeat one that has already been posted unless you are providing new information 

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