Validity of a self-administered food-frequency questionnaire in the estimation of amino acid intake.

Validity of a Self-Administered Food-Frequency Questionnaire for Assessing Amino Acid Intake in Japan: Comparison With Intake From 4-Day Weighed Dietary Records and Plasma Levels

Validity and reliability of a self-administered food frequency questionnaire for the JPHC study: The assessment of amino acid intake

BACKGROUND The Japanese database of food amino acid composition was revised in 2010 after a 24-year interval. To examine the impact of the 2010 revision compared with that of the 1986 revision, we evaluated the validity and reliability of amino acid intakes assessed using a food frequency questionnaire (FFQ). METHODS A FFQ including 138 food items was compared with 7-day dietary records, comp...

Validity of a Self-Administered Food-Frequency Questionnaire for Assessing Amino Acid Intake in Japan: Comparison With Intake From 4-Day Weighed Dietary Records and Plasma Levels.

BACKGROUND Interest in the physiological roles of amino acids and their impact on health outcomes is substantial and growing. This interest has prompted assessment of the habitual intake of amino acids for use in epidemiologic studies and in clarifying the association between habitual intake and plasma levels of amino acids. Here, we investigated the validity of ranking individuals according to...

The Association between Amino Acid Intake and Polycystic Ovary Syndrome in Women Who Referred to Isfahan University of Medical Science Clinics

Background and Objectives: Polycystic ovary syndrome (PCOS) is the greatest current endocrine disease in generative women. Although other issues such as insulin resistance, hyperinsulinemia, adiposity and dietary pattern are implied to be connected to PCOS, but the most recent evidence are needed to improve management of PCOS. Proteins and amino acids (key dietary components) can...

Validity of a self-administered food frequency questionnaire (FFQ) and its generalizability to the estimation of dietary folate intake in Japan

BACKGROUND In an epidemiological study, it is essential to test the validity of the food frequency questionnaire (FFQ) for its ability to estimate dietary intake. The objectives of our study were to 1) validate a FFQ for estimating folate intake, and to identify the foods that contribute to inter-individual variation of folate intake in the Japanese population. METHODS Validity of the FFQ was...