Vitamin D Insufficiency in Overweight and Obese Children and Adolescents

Irina Zakharova, Leonid Klimov, Victoria Kuryaninova, Irina Nikitina, Svetlana Malyavskaya, Svetlana Dolbnya, Anna Kasyanova, Roza Atanesyan, Marina Stoyan, Anastasiya Todieva, Galina Kostrova, Andrey Lebedev, Irina Zakharova, Leonid Klimov, Victoria Kuryaninova, Irina Nikitina, Svetlana Malyavskaya, Svetlana Dolbnya, Anna Kasyanova, Roza Atanesyan, Marina Stoyan, Anastasiya Todieva, Galina Kostrova, Andrey Lebedev

Abstract

Excessive body weight and obesity in childhood and adolescence are becoming more and more important unfavorable factors that entail extremely adverse consequences and require close attention of physicians of any specialty. Along with the high prevalence of obesity and metabolic syndrome in pediatric patients, children and adolescents in the majority of countries are diagnosed with vitamin D deficiency. Among the non-calcaemic effects of vitamin D, a significant role is played by its impact on the hormonal regulation of glucose metabolism and the synthesis of adipokines by fat tissue. The review presents literature data indicative of a close pathogenic relationship between vitamin D insufficiency and impaired tissue insulin sensitivity. It demonstrates the role of vitamin D insufficiency in immune reactions resulting in development of subclinical inflammation in fat tissue infiltrated with macrophages and lymphocytes. It also shows the role of adipokines, immune system cells and pro-inflammatory cytokines produced by them in the pathogenesis of obesity, as well as the function of vitamin D as an endocrine and paracrine regulator of the process of inflammation in adipose tissue. The relationships between the principal adipokines (leptin, adiponectin, resistin) are revealed in the presence of normal vitamin D content and in vitamin D deficiency. The carbohydrate and lipid metabolism parameters in overweight children and adolescents with vitamin D insufficiency are analyzed. A high prevalence of vitamin D insufficiency in overweight and obese children and adolescents (increasing along with the severity of obesity) is demonstrated. The review also presents the current recommendations for the correction of vitamin D insufficiency and underlines the need for higher cholecalciferol doses to achieve serum calcifediol targets in overweight and obese children and adolescents.

Keywords: adipose tissue and autoimmune inflammation; child obesity; vitamin D; vitamin D and obesity; vitamin D and obesity in children.

Figures

Figure 1
Figure 1
The role of the immune system in healthy adipose tissue and in obesity (37, 38).
Figure 2
Figure 2
Various signaling pathways stimulating or inhibiting inflammatory signals (green arrows indicate activation, red arrows show inhibition) (36, 37).
Figure 3
Figure 3
Effects of vitamin D on congenital and acquired immune response (–42).
Figure 4
Figure 4
The mechanism of action of vitamin D in obesity (, –83).
Figure 5
Figure 5
Forest plot between vitamin D deficiency and obesity (84).

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