Obesity and Vitamin D Deficiency: Trends to Promote a More Proatherogenic Cardiometabolic Risk Profile

Vitamin D deficiency is associated with cardiometabolic risk factors (eg, hypertension, insulin resistance, type 2 diabetes mellitus, obesity, and dyslipidemia). We studied 50 obese patients (body mass index [BMI]: 43.5 +/- 9.2 kg/m(2)) and 36 normal weight participants (BMI: 22.6 +/- 1.9 kg/m(2)). The prevalence of vitamin D deficiency (25-hydroxyvitamin D, 25(OH)D LT 50 nmol/L) was 88% among obese patients and 31% among nonobese individuals; 25(OH)D levels were lower in the obese group (27.3 +/- 13.7 vs 64.6 +/- 21.3 nmol/L; P LT .001). There was a negative correlation between vitamin D level and anthropometric indicators of obesity: BMI (r = -0.64; P LT .001), waist circumference (r = -0.59; P LT .001), and body fat percentage (r = -0.64; P LT .001) as well as with fasting plasma insulin (r = -0.35; P LT .001) and homeostasis model assessment of insulin resistance (r = -0.35; P LT .001). In conclusion, we observed a higher prevalence of vitamin D deficiency among obese participants and this was associated with a proatherogenic cardiometabolic risk profile

Vitamin D and Dysfunctional Adipose Tissue in Obesity

Vitamin D deficiency and dysfunctional adipose tissue are involved in the development of cardiometabolic disturbances (eg, hypertension, insulin resistance, type 2 diabetes mellitus, obesity, and dyslipidemia). We evaluated the relation between vitamin D and adipocytokines derived from adipose tissue. We studied 50 obese individuals who were classified into different subgroups according to medians of observed anthropometric parameters (body mass index, body fat percentage, waist circumference, and trunk fat mass). There was a negative correlation between vitamin D level and leptin and resistin (r = -.61, P LT .01), while a positive association with adiponectin concentrations was found (r = .7, P LT .001). Trend estimation showed that increase in vitamin D level is accompanied by intensive increase in adiponectin concentrations (growth coefficient: 12.13). In conclusion, a positive trend was established between vitamin D and the protective adipocytokine adiponectin. The clinical relevance of this relationship needs to be investigated in larger studies