The age of onset and gender are factors that describe the prevalence of certain types of mental illnesses. While the onset of some mental illnesses is related to genetic or physiological factors, that of others is influenced by factors such as environment and lifestyle choices. Socioeconomic factors also increase the risk for certain health conditions. Finally, in humans, cognitive abilities, such as problem solving and memory, change with age and a number of factors influence how these abilities change.

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This week’s theme is to examine how a particular field of psychology (i.e., a field of specific interest to you) arrived to its current form and what major theories are associated with that field of psychology. For this particular assignment, we are going to discuss the major theories related to your field of interest in psychology. 
Field of interest: Why humans live the way that they do?
Review at least 3 scholarly sources on the major theories related to your interests in psychology