The Pictorial Diet History Questionnaire (PDHQ) is an adaptation of
the National Institute of Health’s Diet History Questionnaire. The
purpose of this questionnaire is to obtain detailed information about
the types and quantities of foods the participant has eaten over the past year. In this web-based version we have included pictures of each food in order to help the participants report more accuratley the foods they typically eat. Read More >

Pictorial DHQ offers additional benefits related to usability and quality assurance. Read More >