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Understanding how vitamin D affects various body tissues is crucial for women’s bone, reproductive, immune, and mental health. According to research, modern women often lack sufficient vitamin D. And the impact of such deficiency is diverse but never positive.
Researchers from the Federal University of Rio de Janeiro investigated the relationship between body composition and this important vitamin status in adult women of reproductive age.
About the Study
A total of 124 Brazilian women aged 20 to 49 participated in a cross-sectional study from August 2018 to August 2019. The study included clinical dietary history, anthropometric measurements, and biochemical assessments.
Researchers measured the concentration of 25-hydroxyvitamin D (25(OH)D) using high-performance liquid chromatography. A level of ≥30 ng/ml was defined as sufficient, levels ≥20 and <30 ng/ml as insufficient, and concentrations <20 ng/ml were classified as deficient.
Anthropometric assessments included measurements of weight, height, waist circumference, hip circumference, triceps skinfold thickness, and arm circumference. 66.9% of the participants had a normal Body Mass Index (BMI), 9.7% were obese, and 23.4% were overweight.
Vitamin D Status Influences Body Fat Distribution
Among women with sufficient vitamin D levels, the obesity index was significantly lower compared to those deficient in the vitamin. Additionally, the latter group had a higher waist-to-height ratio. Women with sufficient vitamin levels also had a higher muscle mass index than those with insufficient levels.
When dividing participants by vitamin D status and BMI, researchers observed significant differences in body composition indicators.
For instance, women with vitamin deficiency and normal weight had a higher waist-to-height ratio than participants with normal vitamin D levels. Moreover, women with excess weight and vitamin deficiency demonstrated a higher height-to-hip circumference ratio.
Overall, all indicators, including BMI, percentage of body fat, and muscle mass, were better in the group with sufficient vitamin concentration.
Scientists’ Conclusions
Researchers believe that the prevalence of vitamin D deficiency among women requires attention from both women themselves and healthcare professionals. The study results demonstrate that normal vitamin concentration is associated with lower fat mass, especially in the abdominal area. Additionally, muscle volume in such women is also higher.
Vitamin D is decreased when visceral obesity is present, which poses potential cardiometabolic risks. The study suggests including body composition variables such as waist-to-height ratio and muscle mass in clinical practice to mitigate the metabolic consequences of this vitamin deficiency.
