Vitamin D deficiency - a possible link between osteoporosis and metabolic syndrome

The aim of our study was to evaluate the relationship between bone mineral density (examined by DXA - dual energy x-ray absorptiometry), vitamin D3 levels and the signs of metabolic syndrome.

We examined 55 subjects (37 women, 18 men, age median 67.8 years) with no history of osteoporosis, suffering from metabolic syndrome (defined as abdominal obesity and more than 2 of other components - arterial hypertension, dyslipidemia and diabetes mellitus or impaired glucose tolerance, according to IDF, 2006).

Osteoporosis (T-score less than - 2.5) was found in 32.7 % (15 women and 3 men) and osteopenia (T-score between - 1.5 and - 2.5) in 29 % (13 women and 3 men) of patients. We observed a negative correlation between BMI and fat percentage (examined by DXA) and vitamin D3 levels. Low concentration of vitamin D3 was found in 90 % of patients with median 19.36 ug/l (64 % measured in winter, 36 % in summer, no relationship between vitamin D3 levels and season). We also observed a negative correlation between the low concentration of vitamin D3 and presence of diabetes mellitus as a part of metabolic syndrome.

The link between osteoporosis and metabolic syndrome could influence the therapeutic approach in both disorders and vitamin D supplementation may play an important role in prevention of these severe conditions (Tab. 5, Fig. 1, Ref. 29).