Correction of Vitamin D Levels and Its Effect on Insulin Resistance and Weight Gain in Obese Youth
This trial is active, not recruiting.
|Conditions||obesity, insulin resistance, vitamin d deficiency|
|Sponsor||University of Texas Southwestern Medical Center|
|Start date||March 2011|
|End date||January 2014|
|Trial size||110 participants|
|Trial identifier||NCT02168660, UT092010-217|
Vitamin D deficiency is extremely common in obese youth. In our obese population followed in the Endocrinology clinic at CMC, vitamin D levels were inversely correlated with a measure of insulin resistance. We propose to show that correction of vitamin D levels in obese children and adolescents improves their insulin sensitivity. Obese youth presenting to the Center for Obesity and its Consequences on Health (COACH) clinic will be randomized to receive either the most recent Institute of Medicine (IOM) recommendations of minimum D3 dose of 600 IU/day (1), or receive higher doses of D3 such that the blood levels of vitamin D will be brought to a target level in either the low part or high part of the normal range. The goal is to determine if correction of vitamin D deficiency will improve insulin sensitivity in this group. Secondary goals include determining whether correction of vitamin D deficiency in obese adolescents and children results in less weight gain, and determining the amount of D3 required to correct vitamin D levels in this population.
Our specific hypotheses are as follows:
Hypothesis #1 Obese youth treated with Vitamin D3 who achieve low-normal 25-OHD levels (30-50 ng/mL) or high-normal 25-OHD levels (60-80 ng/mL) will have improved insulin resistance, as measured by HOMA-IR, compared to those individuals with deficient 25-OHD levels (< 30 ng/mL).
Hypothesis #2 Subjects with a higher BMI will have higher Vitamin D dose requirements than current IOM recommendations of 600 IU/day and will take a longer period of time to reach target 25-OHD levels.
Hypothesis #3 Subjects with normal 25-OHD levels will demonstrate less weight gain compared to subjects on the control arm.
|Endpoint classification||efficacy study|
|Intervention model||parallel assignment|
log delta HOMA-IR versus delta 25-OHD
time frame: end of study (4-12 mo)
Time to normalization of Vit D level versus BMI Z score
time frame: 1 to 12 months
delta BMI Z score versus delta 25-OHD level
time frame: study end, 4-12 months
Male or female participants from 6 years up to 17 years old.
Inclusion Criteria: - age 6-17 years - BMI > 95% for age - serum 25-OH D level < or + to 25 ng/mL Exclusion Criteria: - BMI < 95% for age - serum 25-OH D level > 25 ng/mL - current Vitamin D supplementation > 400 IU/day - anti-convulsant therapy, anti-hypertensive therapy, lipid lowering medication - any medications that affect glucose metabolism (e.g., metformin, insulin) - daily glucocorticoid therapy - diabetes - any disorders of bone or calcium metabolism - hepatic or renal disease - any malabsorptive disorder - baseline serum Calcium > 11 ng/dL (> 2 SD above the mean) - any genetic disorder that predisposes to obesity (e.g., Prader Willi - hypothalamic obesity
|Official title||Normalization of Vitamin D Levels and Its Effect on Glucose Homeostasis in Obese Youth|
|Principal investigator||Michele R Hutchison, MD, PhD|
|Description||Concise Summary of Project: The proposed study is a prospective, unblinded dose-ranging trial to examine in obese youth 1) the effect of correcting Vitamin D (Vit D) deficiency on insulin resistance, 2) the effect of correcting Vit D deficiency on weight gain, and 3) the amount of Vit D3 required to achieve Vit D sufficiency in obese adolescents. Subjects will be recruited from obese children and adolescents aged 6 to 17 years presenting to the COACH clinic, a referral clinic for obese children at Children's Medical Center of Dallas. Approximately 1300 new patients are seen in the COACH clinic each year. Ethnicity will be self-assigned as African-American, Caucasian, Hispanic, or Other. The ethnic makeup of the COACH clinic over the last 20 months was as follows: African-American 25%, Caucasian 19.5%, Hispanic 52%, and Other 3.5%. As per standard practice in the COACH clinic, a height (cm), weight (kg), and blood pressure will be obtained, and body mass index (kg/m2) calculated for each patient. Fasting total cholesterol, LDL, HDL, triglyceride, 25-OHD, Hemoglobin A1c (A1c), and fasting insulin will be obtained, and an Oral Glucose Tolerance Test (OGTT) performed. The baseline estimate of insulin sensitivity is calculated from the fasting insulin and glucose values, and reported as the HOMA-IR. After Informed Consent has been obtained, participants will be randomized to either the Control group (5000 IU/wk), the Low-normal 25-OHD group (target 25-OHD 30-50 ng/mL), or the High-normal 25-OHD group (target 25-OHD 60-80 ng/mL). A 25-OHD < 25 ng/mL will be confirmed. These groups will be matched for age (6-12 years versus 13-17 years) and ethnicity (Caucasian versus African-American verus Hispanic). Approximately 60 patients will be recruited for each group. Subject participation will continue until Vit D sufficiency has been documented for 4 consecutive months, at which point the fasting insulin and glucose values will be repeated for calculation of HOMA-IR and assessment of insulin sensitivity, and amount of weight gain will be measured.|
Call for more information