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Dietary silicon intake and absorption.

Ravin Jugdaohsingh1, Simon H C Anderson, Katherine L Tucker

  • 1Gastrointestinal Laboratory, The Rayne Institute, St Thomas' Hospital, London, UK. ravin.jugdaohsingh@kcl.ac.uk

The American Journal of Clinical Nutrition
|April 27, 2002
PubMed
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Dietary silicon intake is significant for bone health, with men consuming more than women. Major food sources like beer and bananas provide readily available silicon, supporting its role in bone formation.

Area of Science:

  • Nutritional Science
  • Biochemistry
  • Human Physiology

Background:

  • Emerging evidence highlights silicon's crucial role in bone formation.
  • Dietary intake is the primary human source of silicon.
  • Bioavailability of silicon from solid foods requires further understanding.

Purpose of the Study:

  • To quantify silicon intake in adult men and women across different age groups.
  • To identify key food sources contributing to dietary silicon.
  • To assess gastrointestinal silicon uptake from various food sources and its correlation with food silicon content.

Main Methods:

  • Silicon intake was assessed using a 126-item food-frequency questionnaire in Framingham Study cohorts.
  • Gastrointestinal silicon uptake was estimated in healthy subjects via urinary silicon excretion.

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  • Urinary silicon excretion served as a surrogate marker for silicon absorption.

    • Main Results:

    • Men exhibited significantly higher silicon intake (30-33 mg/d) than women (24-25 mg/d).
    • Silicon intake decreased with advancing age, irrespective of sex.
    • Beer and bananas were primary silicon sources for men; bananas and string beans for women.
    • Approximately 41% of ingested silicon was excreted in urine, indicating ready availability.
    • Food silicon content strongly correlated with urinary silicon excretion (P=0.019).

    Conclusions:

    • Solid foods represent a significant source of bioavailable dietary silicon.
    • The established link between dietary silicon and bone health warrants further investigation.