Participants in the studies filled out detailed food questionnaires every two to four years. (sciencedaily.com)
Many nutritional studies have the drawback of relying on self - reported consumption based on food questionnaires. (articles.mercola.com)
He and a team of researchers looked at data from food questionnaires and a scale that measures symptoms of depressive disorders from postmenopausal women in the Women's Health Initiative Observational Study. (health.com)