Prevalence of lactose intolerance and its association with breakfast consumption in Iranian adolescents

Purpose Lactose intolerance (LI) is a disturbing gastrointestinal disorder with a high prevalence in all parts of the world, especially in Asian countries. The purpose of this study is to investigate the prevalence of LI in students from Zabol, Iran. Design/methodology/approach Based on cluster random sampling method, 887 subjects were selected for the study. Of all, 54.7 per cent of the students were boys. The mean (±SD) of age, weight and body...