Bone mass in a group of lebanese girls from Beirut and french girls from orleans

To compare bone mineral content [BMC] and bone mineral density [BMD] in a group of Lebanese girls from Beirut and French girls from Orl‚ans. This study included 26 French adolescent girls [15.3 +/- 0.7 years old] and 24 maturationmatched [15.4 +/- 1.1 years old] Lebanese adolescent girls. BMC, BMD at the whole body [WB] and body composition [lean mass and fat mass] were assessed by dual-energy X-ray absorptiometry [DXA]. Calculations of the bone mineral apparent density [BMAD] and the ratio BMC/height were completed for the WB. Weight and height were similar in the two groups. Lean mass was higher in French girls compared to Lebanese girls [p < 0.05]. In the whole population, lean mass was a positive determinant of BMC and BMD. French girls displayed higher values of BMC, BMD, BMC/height and BMAD than Lebanese girls [p < 0.05]. Finally, BMC and BMD remained higher in French girls in comparison to Lebanese girls even after adjusting for lean mass. In this study group, Lebanese girls have lower BMC and BMD in comparison to French girls

[Body mass index and body fat in Lebanese female adolescents]

The aim of this study is to investigate the relation between body mass index [BMI] and body fat [BF] among Lebanese female adolescents. 51 Lebanese females aged 12 to 18 years participated in this study. BMI was calculated as weight/height. Adiposity was measured by dual energy X-ray absorptiometry [DEXA]. Correlation coefficient of percent body fat [%BF] with BMI is 0.82. Correlation coefficient of fat mass [BF] with BMI is 0.93. The two linear regression formulas are:%BF=6.89+ [1.1 *BMI] and BF=-0.425+ [129 *BMI]. Correlations of BMI with DEXA measurements were higher with BF than%BF. For a given BMI, Lebanese girls have a higher than expected%BF. Based on the current findings, there may be a need to develop new cutoff points. From a public health perspective, this may considerably increase the prevalence of obesity among Lebanese female adolescents

[Daily calcium intake and body mass index in a group of Lebanese adolescents]

To investigate the relationship between daily calcium intake [DCI] and body mass index [BMI] in a group of Lebanese adolescents. 419 adolescents [219 boys and 169 girls] aged 13-18 years participated in our study. DCI was calculated using a validated questionnaire, and anthropometrical characteristics [weight and height] were measured. In this study, only 20% of the adolescents met the adequate DCI recommendation of 1300 mg/day. Boys had a significantly higher mean DCI than girls [1023 +/- 360 mg/d and 839 +/- 303 mg/d respectively for boys and girls; p < 0.001]. DCI was negatively related to BMI in boys [r = -0.15; p < 0.05] but not in girls. Obese boys had a significantly lower mean DCI than those whose BMI was normal [869 +/- 249 mg/d and 1043 +/- 373 mg/d respectively; p < 0.05]. In this study, 80% of the adolescents do not meet the DCI adequate intake. It seems important to encourage these adolescents to increase their DCI. Moreover, this study shows that DCI is inversely related to age in girls and to BMI in boys

Leptin, insulin, IGF-1 and bone mass in a group of sedentary adolescent girls

To investigate the relationships between serum leptin, IGF-1, insulin and bone mineral content and density in a group of Lebanese sedentary adolescent girls. Twenty Lebanese sedentary adolescent girls participated in our study. Total body bone mineral content and density were measured by dual-energy X-ray absorptiometry [DEXA]. In parallel, fasting leptin, IGF-1 and insulin concentrations were also measured. Serum leptin, IGF-1 and insulin concentrations were not associated with total body bone mineral content [BMC], total body bone mineral density [BMD] or pelvis BMD. Serum leptin, IGF-1 and insulin concentrations are not positive predictors of total body bone mineral content or density in this study group