eng Science and Education Publishing Journal of Food and Nutrition Research 2333-1240 2016-10-13 4 10 677 689 10.12691/jfnr-4-10-8 JFNR20164108 article Todd R. Schachtman schachtmant@missouri.edu 1 Diana Klakotskaia 1 Jennifer M. Walker 2 Andrew J. Hill 3 Department of Psychological Sciences, University of Missouri, Columbia, Missouri, United States of America Department of Medicine, Division of Diabetes, Endocrinology and Metabolism, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America Academic Unit of Psychiatry & Behavioral Sciences, School of Medicine, University of Leeds, Leeds, United Kingdom The etiology of nausea and vomiting during pregnancy (NVP) involves many variables that influence its onset, duration, and severity; and it is well known that its occurrence has health implications for the offspring. This review focuses on psychological and psychosocial factors as influences on NVP ('morning sickness'), including cultural, social, and associative variables. Certain foods are more likely to result in NVP than others, and this often stems from women's experiential history with those food substances, including the potential to form associative-based aversions. Moreover, acknowledging the role of associative factors could influence the magnitude of NVP. Many demographic variables (e.g., geographical regions, age, socio-economic status) are related to NVP, but whether a population has more women with NVP may be due to certain foods being more common or rare in the diet of that population, as predicted by theories of associative processes. Consideration of the role of associative processes on NVP has implications for understanding its cause and magnitude. Also, mood and poorer psychological adjustment can exacerbate NVP. Issues related to management or treatment of the disorder are reviewed. http://pubs.sciepub.com/jfnr/4/10/8/jfnr-4-10-8.pdf nausea vomiting pregnancy conditioning morning sickness NVP