[Effect of long term supplementation of mineral-fortified dephytinized soy milk powder on biomarkers of bone turnover in boys aged 12 to 14 years].

Objectives: In order to understand the effect of long term consumption of mineral-fortified dephytinized soy milk powder on skeletal health in children, biological effects of mineral-fortified dephytinized soy milk powder, dephytinized mineral-unfortified soy milk powder and fresh mineral-fortified cow milk were compared.

Methods: Totally, 90 boys aged 12 to 14 years were involved in the study and were given daily with mineral-fortified dephytinized soy milk powder, dephytinized soy milk powder and fresh fortified cow milk, respectively, for two months. The blood samples were collected from all the subjects for measuring activity of serum bone specific alkaline phosphatase and serum level of oesteocalcin, and the urine samples were collected for determining urine C-terminal telopeptides of type I collagen (CTx).

[A study on absorption and utilization of calcium, iron and zinc in mineral-fortified and dephytinized soy milk powder consumed by boys aged 12 to 14 years].

Objectives: In order to understand the absorption and utilization of calcium, iron and zinc in cow milk, soy milk powder and dephytinized soy milk powder in the children and adolescents, and to lay a foundation for the improvement of protein and mineral nutrition in Chinese residents with popularizing consumption of soy milk powder.

Methods: Totally, 57 boys aged 12 to 14 years were selected and divided into three groups, matched by age, hemoglobin concentration, height and weight. The boys were given 220 ml of fortified and dephytinized soy milk, soy milk or cow milk, respectively, containing calcium 270 mg, iron 4 mg and zinc 4 mg, which were labeled with stable isotopes (44)Ca, (58)Fe and (70)Zn in a single serving size, and their feces were labeled with brilliant blue and dysprosium.

Use of a short-term isotope-dilution method for determining the vitamin A status of children.

Background: After a dose of labeled vitamin A is given to humans for estimating body stores of vitamin A, blood is customarily drawn at pseudo-equilibration times ranging from 11 to 26 d.

Objective: The objective was to determine whether a shorter sample collection interval (6 h or 3 d), which would be more realistic in field settings, can be used.

Design: Correlations of enrichment at 6 h or 3 d with enrichment at 21 d were made after an oral dose of deuterium-labeled vitamin A was given to Chinese schoolchildren (aged 10-11 y; n = 58) with marginal-to-normal vitamin A status.