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Related Experiment Videos

Optimal dietary calcium intake in primary hyperparathyroidism

F G Locker1, S J Silverberg, J P Bilezikian

  • 1Department of Medicine, College of Physicians & Surgeons, Columbia University, New York, New York 10032, USA.

The American Journal of Medicine
|June 1, 1997
PubMed
Summary

Dietary calcium intake did not affect bone density or biochemical markers in primary hyperparathyroidism. Patients with elevated 1,25-dihydroxyvitamin D should limit calcium to prevent excess urinary calcium.

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MANAGEMENT OF ENDOCRINE DISEASE: Therapeutics of Vitamin D.

European journal of endocrinology·2018

Area of Science:

  • Endocrinology
  • Metabolic Bone Disease

Background:

  • Primary hyperparathyroidism (PHPT) is a common endocrine disorder.
  • Dietary calcium intake is a key factor in calcium homeostasis.
  • The role of dietary calcium in PHPT, particularly concerning vitamin D metabolism and bone health, requires further investigation.

Purpose of the Study:

  • To investigate the association between dietary calcium intake and bone mineral density (BMD) and biochemical parameters in patients with PHPT.
  • To determine if these associations are influenced by 1,25-dihydroxyvitamin D levels.

Main Methods:

  • 71 patients with PHPT were categorized into three dietary calcium intake groups: very low (<300 mg/day), low (300-800 mg/day), and US RDA (>800 mg/day).
  • Biochemical markers (serum calcium, phosphorus, parathyroid hormone, 25-hydroxyvitamin D, 1,25-dihydroxyvitamin D, urinary calcium) and BMD (dual-energy X-ray absorptiometry) were assessed.

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Main Results:

  • No significant effect of dietary calcium on BMD, parathyroid hormone, or other biochemical markers was observed across the entire patient cohort.
  • Serum 1,25-dihydroxyvitamin D was elevated in 52% of patients.
  • Patients with elevated 1,25-dihydroxyvitamin D, despite similar low calcium intake, showed higher parathyroid hormone and urinary calcium levels compared to those with normal 1,25-dihydroxyvitamin D.

Conclusions:

  • Patients with normal 1,25-dihydroxyvitamin D levels can increase dietary calcium intake without adverse effects.
  • Individuals with elevated 1,25-dihydroxyvitamin D should restrict calcium intake to prevent hypercalciuria and potential kidney complications.