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Related Experiment Videos

Determining human dietary requirements for boron.

B Sutherland1, P Strong, J C King

  • 1Department of Nutritional Sciences, University of California, Berkeley 94720, USA.

Biological Trace Element Research
|March 2, 1999
PubMed
Summary

Boron is an essential dietary component. This study shows that the kidneys regulate boron levels by adjusting urinary excretion based on dietary intake, suggesting a homeostatic mechanism.

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Area of Science:

  • Nutritional Science
  • Human Physiology
  • Biochemistry

Background:

  • Dietary requirements are crucial for maintaining health and preventing deficiency diseases.
  • Boron (B) is an essential dietary component, vital for health, as evidenced by animal studies showing developmental defects at low B levels.
  • Human studies suggest boron plays a role in bone metabolism and exhibits homeostatic regulation.

Purpose of the Study:

  • To investigate the relationship between dietary boron intake and boron homeostasis in humans.
  • To determine the role of the kidney in regulating boron levels.
  • To provide data for establishing future dietary requirements for boron.

Main Methods:

  • Controlled metabolic study involving seven male participants over a 42-day period.
  • Measurement of dietary boron intake and urinary boron excretion.
  • Analysis of urinary boron losses in relation to varying dietary boron levels.

Main Results:

  • Average daily dietary boron intake varied across different menu days (4.56, 1.87, and 4.75 mg/d).
  • Average urinary boron excretion was 3.20 +/- 0.41 mg/d.
  • Urinary boron excretion was significantly lower when dietary boron intake was low (2.92 mg/d) compared to higher intakes (3.15 and 3.54 mg/d), indicating rapid renal regulation.

Conclusions:

  • Urinary boron excretion rapidly adjusts to changes in dietary boron intake.
  • The kidney appears to be the primary site for homeostatic regulation of boron in humans.
  • Further research on boron homeostasis, functional markers, and epidemiological studies are needed to establish dietary requirements and identify health conditions linked to inadequate boron intake.

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