Vitamin D- function, deficiency

Vitamin D- function, deficiency


Functions of Vitamin D-

  1. Increases internal absorption of calcium.
  2. Increases calcium and phosphorous reabsorption.
  3. Mobilizes bone mineral.
  4. Prevents infection by mycobacterium tuberculosis.

Sources of Vitamin D-

  • Only animal sources Liver, Egg yolk, butter and liver oils. Out of the food sources Fish liver oils are the richest source
  • Sunlight

Vitamin D deficiency-

  • Rickets in children
  • Osteomalacia in adults

       

Vitamin D Intoxication-

  • Vitamin D in excess is toxic (4000IU/day) .
  • Infants are sensitive to intakes of Vitamin D as low as 50 μg/day.

Clinical features-

  • Excessive bone resorption
  • Mestatic calcification (calcinosis)
  • Nephrolithiasis
  • Polyuria
  • CNS, GIT, CVS symptoms.

Exam Important

1. Prevents infection by mycobacterium tuberculosis.

2. Only animal sources Liver, Egg yolk, butter and liver oils. Out of the food sources Fish liver oils are the richest source

3. Sunlight

4. Vitamin D deficiency-

  • Rickets in children
  • Osteomalacia in adultsVitamin D Intoxication-

5. Vitamin D in excess is toxic (4000IU/day) .

  • Infants are sensitive to intakes of Vitamin D as low as 50 μg/day
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