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Context The adverse skeletal effects of type 1 diabetes (T1D) include deficient bone accrual and lifelong increased fracture risk. The contributors to impaired bone accrual in people with T1D are incompletely understood. Objective To determine if urinary calcium excretion is associated with impaired bone accrual in youth with T1D and to characterize the contribution of glycemic control and markers of bone mineral metabolism to urinary calcium excretion. Design Observational study. Participants 50 participants with T1D aged 6-20 years completed a 12-month longitudinal study of bone accrual. A second cohort of 99 similarly aged participants with T1D completed cross-sectional 24-hr urine and blood collections. Main Outcome Measure Whole body less head bone mineral content (WBLH BMC) velocity Z-score and fractional excretion of calcium (FeCa). Results Participants in the bone accrual cohort had lower WBLH BMC velocity compared to a healthy reference dataset (Z-score −0.3 ± 1.0, p=0.03). FeCa was negatively associated with WBLH BMC velocity Z-score, ρ= −0.47, p=0.001. In the urinary calcium excretion cohort, intact parathyroid hormone (β= −0.4, p=0.01), beta c-telopeptide (β=0.35, p=0.007), and either hemoglobin A1c (HbA1c, β=0.08, p=0.03) or urine fractional glucose excretion (β=0.07, p=0.03) were associated with FeCa in multivariable regression models that included known determinants of urinary calcium excretion. Conclusions Urinary calcium excretion was negatively associated with bone accrual in this cohort of youth with T1D. Mechanistic studies are needed to determine if interventions to reduce urinary calcium excretion could increase bone accrual and reduce skeletal fragility in people with T1D.
Context The adverse skeletal effects of type 1 diabetes (T1D) include deficient bone accrual and lifelong increased fracture risk. The contributors to impaired bone accrual in people with T1D are incompletely understood. Objective To determine if urinary calcium excretion is associated with impaired bone accrual in youth with T1D and to characterize the contribution of glycemic control and markers of bone mineral metabolism to urinary calcium excretion. Design Observational study. Participants 50 participants with T1D aged 6-20 years completed a 12-month longitudinal study of bone accrual. A second cohort of 99 similarly aged participants with T1D completed cross-sectional 24-hr urine and blood collections. Main Outcome Measure Whole body less head bone mineral content (WBLH BMC) velocity Z-score and fractional excretion of calcium (FeCa). Results Participants in the bone accrual cohort had lower WBLH BMC velocity compared to a healthy reference dataset (Z-score −0.3 ± 1.0, p=0.03). FeCa was negatively associated with WBLH BMC velocity Z-score, ρ= −0.47, p=0.001. In the urinary calcium excretion cohort, intact parathyroid hormone (β= −0.4, p=0.01), beta c-telopeptide (β=0.35, p=0.007), and either hemoglobin A1c (HbA1c, β=0.08, p=0.03) or urine fractional glucose excretion (β=0.07, p=0.03) were associated with FeCa in multivariable regression models that included known determinants of urinary calcium excretion. Conclusions Urinary calcium excretion was negatively associated with bone accrual in this cohort of youth with T1D. Mechanistic studies are needed to determine if interventions to reduce urinary calcium excretion could increase bone accrual and reduce skeletal fragility in people with T1D.
Background & objectives Globally, vitamin D deficiency has been incriminated in poor bone health and growth retardation in children, impaired adult musculoskeletal health (classically described), increased risk of cardiovascular events, immune dysfunction, neurologic disorders, insulin resistance and its multiple sequelae, polycystic ovary syndrome (PCOS) and certain cancers. This review intends to holistically highlight the burden of vitamin D deficiency among children in India, the public health importance, and potential therapeutic and preventive options, utilizing the concept of implementation research. Methods A systematic search was carried out on PubMed, Embase, China National Knowledge Infrastructure (CNKI) and Cochrane database, clinicaltrials.gov, Google Scholar, and ctri.nic.in with the keywords or MeSH terms namely ‘vitamin D’, ‘cholecalciferol’, ‘ergocalciferol’, ‘children’, connected with appropriate boolean operators. Results Vitamin D deficiency/insufficiency prevalence varies from 70-90 per cent in Indian children. Rickets, stunting, impaired bone mineral health, and dental health are common problems in these children. Serum 25-hydroxy vitamin D (25(OH)D) should be maintained >20 ng/ml in children. Oral vitamin D supplementation has a high therapeutic window (1200-10,000 IU/d well tolerated). Fortification of grains, cereal, milk, bread, fruit juice, yogurt, and cheese with vitamin D has been tried in different countries across the globe. From Indian perspective, fortification of food items which is virtually used by everyone would be ideal like fortified milk or cooking oil. Fortification of “laddus” made from “Bengal gram” with vitamin D as a part of a mid-day meal programme for children can be an option. Interpretation & conclusions There is enough evidence from India to suggest the importance and utility of food fortification with vitamin D to address the epidemic of vitamin D deficiency/insufficiency in children.
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