Arai Y, Takahashi M and Kurosawa H
Department of Orthopaedic Surgery, School of Medicine, Juntendo University, Japan

Shitoto K
Department of Orthopaedic Surgery, Urayasu Hospital, Juntendo University, Japan

An adequate calcium intake and vitamin-D status is important for bone mineralization in adolescents. In Northern China, calcium intake and plasma vitamin-D level of adolescents is low due to low consumption of dairy foods and inadequate sunshine exposure. True fractional calcium absorption (TFCA) in Chinese adolescents has never been performed. This study aims to evaluate nutritional adaptation namely, TFCA and urinary calcium excretion among Chinese adolescents in northern China.

Key words: calcium absorption; calcium intake; 25- hydroxyvitamin D; puberty; Chinese