Abstract
Silicon in nutritional amounts provides benefits for bone health and cognitive function. The relationship between silicon intake from a common daily diet and silicon blood level has been scarcely elucidated, so far. The aim of this study was to analyze the associations between plasma silicon levels and the total and bioavailable silicon intake—along with the contribution of silicon made by food groups—in a healthy adult Polish population. Si intake was evaluated in 185 healthy adults (94 females and 91 males, aged 20–70) using a 3-day dietary recall and a database on the silicon content in foods, which was based on both previously published data and our own research. Fasting plasma silicon levels were measured in 126 consenting subjects, using graphite furnace atomic absorption spectrometry. The silicon intake in the Polish population differed significantly according to sex, amounting to 24.0 mg/day in women and 27.7 mg/day in men. The median plasma silicon level was 152.3 µg/L having no gender dependency but with a negative correlation with age. Significant correlations were found between plasma silicon level and total and bioavailable silicon intake, as well as water intake in the diet (r = 0.18, p = 0.044; r = 0.23, p = 0.011; r = 0.28, p = 0.002, respectively). Silicon intakes from non-alcoholic beverages, cereal foods, and carotene-rich vegetables were also positively associated with plasma silicon levels. These results may help establish dietary silicon recommendations and formulate practical advice on dietary choices to ensure an appropriate supply of silicon. The outcome of this study, however, needs to be confirmed by large-scale epidemiological investigations.
Highlights
The essentiality of silicon in human health is supported by a growing body of evidence [1,2,3].Epidemiological studies have shown that dietary silicon was favorably related to markers of bone density and turnover
Only a few reports have been published on silicon concentrations in the blood, and the values reported for fasting serum concentration in healthy adult subjects have ranged from 100 to 310 μg/L
Silicon content was measured in beverages, which are mostly manufactured by domestic producers usually from concentrates reconstituted with water
Summary
Epidemiological studies have shown that dietary silicon was favorably related to markers of bone density and turnover. The silicon level in the blood may be considered as a silicon status indicator. Only a few reports have been published on silicon concentrations in the blood, and the values reported for fasting serum concentration in healthy adult subjects have ranged from 100 to 310 μg/L. The relationship between silicon intake from a common daily diet and silicon blood level has so far been scarcely elucidated [8]. This results partly from the limited number of studies on the silicon content in foods and its intake in the diet
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