In the attempt to determine and quantify nutritional factors related to the onset of disease in the human population. epidemiologic analyses are being applied in cross sectional, case-control, and cohort studies (see chap. 6). Relationships between the eating behaviour of individuals and the onset or prevalence of risk factors and chronic diseases are being examined and quantified. Conducting such studies internationally, by broadening the range of observation, enhances the ability to identify risk differentials and thereby strengthens the conclusions drawn from population studies.
Nutritional epidemiology incorporates the attempt to collect, systematically and in an unbiased manner, information on the eating behaviour of individuals and groups for use in illuminating or testing correlates and causality of disease.