Assessment of vitamin status of the workers of Samara thermal power plant according to data on vitamin intake and their levels in blood

AbstractSufficiency of 58 employees of a thermal power plant (47 men and 11 women aged 21 to 64 years, body mass index – 27.0±5.8 kg/m2), with vitamins A, E, D, B6, B12, folic acid and carotenoids (content in the blood plasma) and vitamin C (urinary excretion) was conducted in winter (February 2015). All surveyed workers were sufficiently supplied with vitamins A, B6, B12 and folic acid (a reduced level was detected in 0–9%). Insufficient supplying with vitamin E had 19% of the workers (and only men), vitamin C – 44%, vitamin D – 61%, carotenoids – 93%. Only 5% persons were sufficiently provided with all 6 vitamins. A combined deficiency of two vitamins had 38% of them, three – 22%, four – 16%. Simultaneously reduced plasma level of two antioxidants was observed in 36% of subjects, three – in 12%. Significant positive correlation (p<0.05) was detected between plasma levels: total cholesterol and retinol and β-carotene; tocopherol and total cholesterol, triglycerides, low density lipoprotein cholesterol; between the concentration of vitamin D, and high density lipoproteins; levels of retinol and tocopherol and β-carotene. In parallel intake of vitamins C, A, B1, B2 and niacin has been assessed by calculation of the frequency of food consumption during the previous month. Reduced relatively recommended daily intake of vitamins A, C has been found in approximately half of the surveyed, niacin, vitamin B1 and B2 – in 70–80%. Comparison of the data on the availability of vitamins C and A, obtained by calculation of vitamin intake and biochemical methods gave identical results in 55 and 60% of cases, correspondingly. The lack of vitamins has been detected more frequently by assessing dietary intake.

Keywords:vitamins, blood plasma concentration, vitamin deficiency, dietary intake, the probabilistic risk of inadequate intake of vitamins, people of working age