Calcaneal ultrasound and its relation to dietary and lifestyle factors, anthropometry, and vitamin D deficiency in young medical students

Background: Bone quality and peak bone mass are greatly affected by lifestyle factors. The objective of the study was to investigate the relationships between anthropometry, dietary and caloric intake, body composition measurements, physical activity, and vitamin D status with quantitative ultrasound-based bone parameters among medical students.Methods: Both male and female medical college students were included in this study. A detailed questionnaire was administered, collecting clinical, dietary, physical activity information, physical examination details, including body mass index (BMI). Body composition (total body fat, total body water, muscle mass, mean visceral fat mass, basal metabolic rate, bone mass using a bioelectrical impedance analyzer) and calcaneal heel ultrasound parameters were measured using an Osteosys Sonost-3000, Ultrasound Bone Densitometer were measured, respectively.Results: In this cross-sectional study, 211 healthy students with a mean age of 20.1 ± 1.1 years, 51.7% (n = 109) were males. Majority (79.4%) of the young adults had vitamin D deficiency. The mean BMI, calcium intake, and vitamin D levels were 22.35 ± 3.43 kg/m2, 788.7 ± 364.8 mg/day, and 15.02 ± 8.63 ng/ml, respectively. Female subjects compared to males had statistically significantly lower daily energy intake, muscle mass, visceral fat mass, calcium intake, and vitamin D levels. In addition the median Z-scores in females [-1.40 (-0.57 to -1.82)] was significantly poorer than the male [-0.50 (0.20 to -1.3)] counterparts, p-value \u3c0.001. Multiple regression analysis showed that overall body fat percent (p-value 0.016) and visceral fat percent (p-value 0.029) were the only significant negative predictors to the calcaneal bone quality index (BQI) values.Conclusion: Adolescent lifestyle patterns can influence young adult bone strength. The young Pakistani females exhibited significantly lower dietary intakes and more inadequate bone parameters compared to males. Our data suggest that total body and visceral fat percent are the predominant negatively associated determinant of bone strength for this cohort. Calcaneal ultrasound can be utilized for mass screening of young adults for identification of low BMD

Assessing the effect of dietary calcium intake and 25 OHD status on bone turnover in women in Pakistan

Summary: Bone health assessed in three towns of Karachi, Pakistan in females showed poor calcium intake, vitamin D deficiency, secondary hyperparathyroidism, and high bone turnover. Correlates of high bone turnover included females residing in Saddar Town, underweight females less than 30 years of age from low socio-economic status, and secondary hyperparathyroidism. Aims: To assess bone health and association of dietary calcium and 25 hydroxy vitamin D with bone turnover in the community-dwelling females of Karachi. Methods: Bone health was assessed in three randomly selected towns of Karachi, Pakistan. One premenopausal female fulfilling the inclusion criteria from each household was included in the study. Dietary calcium was assessed through a food frequency questionnaire and biochemical markers including calcium, phosphates, albumin, magnesium, creatinine, and SGPT, intact parathyroid hormone, 25 hydroxy vitamin D, and N-telopeptide of type I collagen were measured to assess the bone health. Results: Three hundred and five females were included from three towns. Overall, 90.5% of females had vitamin D deficiency with 42.6 and 23.3% having secondary hyperparathyroidism and high bone turn over respectively. Prevalence of vitamin D deficiency, secondary hyperparathyroidism, and high bone turnover was significantly different among towns. Mean vitamin D levels were significantly low and iPTH levels significantly high in females with high bone turnover. Calcium intake was not significantly different among females with normal, high, and low bone turnover. Correlates ofhigh bone turnover included females residing in Saddar Town, underweight females less than 30 years of age belonging to low socio-economic status, and secondary hyperparathyroidism. Conclusion: Compromised bone health is seen in community-dwelling females of Karachi. There is a need to perform large-scale community-based studies in all age groups to understand the interplay of markers in our population to understand the impact of these variables translating into the risk of osteoporosis

Polymorphisms in the GC gene for vitamin D binding protein and their association with vitamin D and bone mass in young adults

Objective: To identify DBP gene rs4588 and rs7041 polymorphisms and associate with participants\u27 serum 25(OH)D and BMD levels.Study design: Cross-sectional descriptive study design.Place and duration of study: Section of Chemical Pathology and Molecular Pathology, Department of Pathology and Laboratory Medicine, The Aga Khan University, Karachi, from July 2014 to September 2015.Methodology: Blood samples from 98 young adults, out of 101 samples collected, were genotyped for GC rs4588 and rs7041 polymorphisms by polymerase chain reaction-based restriction fragment length polymorphism assay. Questionnaires were administered to obtain information on demographics and anthropometric characteristics, BMD was assessed with heel ultrasound and 25(OH)D was measured using a Chemiluminescence immunoassay.Results: High prevalence of vitamin D deficiency was noted in the study population n=87 (86.1%) having median (IQR) 25(OH)D levels of 14.9 (20.9) ng/ml, in males and 12.1 (51.8) ng/ml in females. The C/C genotype of SNP rs4588 had the highest proportion n=50 (51%), whereas for rs7041 genotype G/T was most frequently observed n=53 (54%) in subjects. Highest 25(OH)D levels were observed within the homozygous genotypes C/C median 25(OH)D 14.0 (49.6) and G/G (median 25(OH)D 14.9 (37.1) ng/ml. Statistically significant relationship was noted between rs7041 genotype G/T and BMD (p 0.037).Conclusion: Hypovitaminosis D was frequently found in young adults. Furthermore, G/T variant of rs7041 polymorphism was associated with lower 25(OH)D serum levels

Prevalence of vitamin D deficiency and its correlates: results of a community-based study conducted in Karachi, Pakistan

UNLABELLED: Of the 305 premenopausal females in a cross-sectional study in randomly selected communities of Karachi, Pakistan, 90.1 % showed to be vitamin D deficient. Age, town of residence, and housing structure were significant predictors of vitamin D levels. Measures to address D deficiency and its associated long latency effects are urgently needed.AIMS: This study aims to find out the prevalence and risk factors of vitamin D deficiency in community-dwelling premenopausal females in Karachi.Methods: A cross-sectional study was conducted in randomly selected communities downtown (Saddar) and suburbs (Gulshan and Malir Town) in Karachi, Pakistan. Information related to sociodemographics (age, education, employment, and household income), housing structure, sunlight exposure, and skin pigmentation as well as dietary intake (using a food frequency questionnaire) was collected. Serum vitamins D(3) levels were also measured. Mean and SD was computed for continuous variables and frequency and proportions were computed for categorical variables. Data were further analyzed by Chi-square test and ANOVA. Multiple linear regression analysis was done to find out determinants of vitamin D (VD) levels.Results: Total of 305 premenopausal females were recruited. Mean age, BMI, and waist circumference of the study participants was 31.97±8 years, 25.06±5.6 kg/m(2), and 88.42±13.3 cm, respectively. Majority of the females were vitamin D deficient (91.50 %) with mean vitamin D levels of 21.77±21.66 nm/L. Mean vitamin D levels were significantly different among females residing in downtown and suburbs. High frequency of vitamin D deficiency was observed in females dwelling in downtown (Saddar). According to the results of multiple linear regression analysis, determinants of VD levels were age, town of residence, and housing structure.CONCLUSION: High prevalence of vitamin D deficiency is seen in females in the community of Karachi, Pakistan. Age, town of residence, and housing structure were the significant predictors of vitamin D levels. Measures to combat the issue of D deficiency and its associated long latency effects are urgently needed