25-Hydroxycholecalciferol absorption in steatorrhoea and postgastrectomy osteomalacia

Area of Science:

• Endocrinology
• Gastroenterology
• Nutritional Science

Background:

• Post-gastrectomy osteomalacia is a bone disease linked to vitamin D deficiency.
• Steatorrhea can impair nutrient absorption, including vitamin D.

Purpose of the Study:

• To evaluate the utility of an oral 25-hydroxyvitamin D (25-OHD) absorption test.
• To investigate the causes of vitamin D deficiency in patients with steatorrhea and post-gastrectomy osteomalacia.

Main Methods:

• Oral administration of 25-hydroxycholecalciferol (25-OHD3) to 11 subjects.
• Measurement of post-absorption 25-OHD levels.
• Assessment of fecal fat excretion and dietary vitamin D intake.

Main Results:

• Low post-absorption 25-OHD levels were observed in some patients with steatorrhea.
• Normal absorption was noted in most patients with post-gastrectomy osteomalacia.
• A significant inverse correlation existed between peak 25-OHD levels and fecal fat excretion.
• Subnormal baseline 25-OHD levels in osteomalacia patients suggest vitamin D deficiency.
• Most osteomalacia patients had low dietary vitamin D intake.

Conclusions:

• An oral 25-OHD absorption test may serve as a valuable indicator of small intestinal function.
• Inadequate dietary vitamin D intake appears to be the primary driver of post-gastrectomy osteomalacia, rather than impaired vitamin absorption.