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The influence of obesity on human health, as a multifactorial and multigenic disorder, is a rather complex, interdisciplinary and at the same time extremely urgent problem of modern society. Vitamin D deficiency is one of the consequences of obesity that negatively affects a person’s life expectancy. Vitamin D deficiency is rightfully considered a silent, non-infectious metabolic pandemic of the 21st century. Its significant role in the functioning of the human body is deep and multifaceted, since vitamin D is an integral regulator of the transcriptional activity of genes that control 3–5% of the human genome. There are ongoing discussions among experts in the medical community about the negative impact of obesity on 25 (OH) D levels, and the opposite hypothesis is also being discussed, where vitamin D deficiency is considered an independent risk factor for obesity. Both external causes of the formation of vitamin D deficiency against the background of excessive deposition of adipose tissue and internal metabolic processes underlying the pathogenetic association are analyzed two pathological conditions.