Assessment of iodine intake in vegans: weighed dietary record vs duplicate portion technique

Objective To compare iodine intakes estimated from weighed dietary records with iodine intakes obtained by direct analysis of duplicate diets in a group of vegans.Design Cross-sectional study.Setting London and the south-east of England.Subjects Thirty-three vegans consuming their habitual diet were recruited through the UK Vegan Society; 26 subjects (11 males, 15 females), age 21-84 y, completed the study.Interventions Iodine intakes were estimated from 4 day weighed dietary records and compared with iodine intakes obtained by direct analysis of concurrent 4 day duplicate diets.Results There was wide variation in iodine intakes. Mean daily iodine intake in males was significantly lower (PConclusions The use of current food tables to estimate iodine intake in vegans is limited. It is not always practical to determine iodine intake using the duplicate portion technique, therefore more reliable information on iodine content of foods, incorporating the variation within foods, is needed.