In nutritional case-control studies, also referred to as retrospective and case-referent studies, persons recently diagnosed with a diet-related disease and a group of persons without the disease (the control) from the same population are interviewed concerning their dietary habits.

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Case-control studies involve comparing individuals with a disease (cases) to those without (controls) to identify factors like dietary habits that may contribute to the disease.

In Nutritional Case-Control Studies, Also Referred to as Retrospective and Case-Referent