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.