8-foot time up-and-go ABSI BMI Diabetes H1-99 HM401-1281 Mediterranean diet Qatar Biobank adiposity adolescents anthropometry basal metabolism bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes::JFFP Social interaction bioelectrical impedance body composition body fat body mass index body weight cardio-metabolic risk cardiovascular risk disease children diet diet quality dietary influences dual X-ray absorptiometry elderly energy energy balance exercise fat mass