Considerations in modifying a semiquantitative food frequency questionnaire

Quantifying dietary intake remains a challenge. Although advances have been made, we are still attempting to find a quick yet reliable intake method. Utilizing brief, frequency-type questionnaires that have already been tested is an attractive option. However, many of us would also like to alter those questionnaires to make them more specific to our study population. The items covered in this article should help to illuminate some of the tissues that must be considered.