Bio - genetic material, inheritance from parents, physiological functioning, body defects, body's effectiveness in protecting itself.
Psych - personality, health behaviours, mental processes. Involves: Cognition (learning, remembering, thinking, interpreting, believing , problem-solving), emotion (subjective feeling affecting/affected by thoughts, behaviour and physiology, important part of decision making re treatment), motivation (exploring why people behave the way they do).
Social - each affect levels of social relationships community: individuals who live near one another influence and are influenced by each other . society: promoting certain values through mass media etc. family: strong influence as children grow up -> learn health behaviours (one member can influence entire unit e.g. if one child doesn't like a certain food).
*** example: Mandy's athletic figure = bio contribution of inherited genes, social contribution of family dietary practice, health values and psychological contribution of learning correct eating and exercise behaviours, maintenance through positive reinforcement. Social influence of friends while she's away perpetuates drinking behaviours.