Vitamin deficiency
 |
| Vitamin deficiency | |
|---|---|
| Specialty | Endocrinology  |
Avitaminosis is any disease caused by chronic or long-term vitamin deficiency or caused by a defect in metabolic conversion, such as tryptophan to niacin. They are designated by the same letter as the vitamin.[1][2]
Conversely hypervitaminosis is the syndrome of symptoms caused by over-retention of fat-soluble vitamins in the body.
Types
Avitaminoses include:
- Vitamin A deficiency causes xerophthalmia or night blindness.
- Thiamine deficiency causes beriberi.
- Niacin deficiency (vitamin B3) causes pellagra.
- Vitamin B12 deficiency leads to megaloblastic anemia and subacute combined degeneration of spinal cord.
- Vitamin C deficiency leads to scurvy.
- Vitamin D deficiency causes rickets.
- Vitamin K deficiency causes impaired coagulation.
References
- ^ Lee Russell McDowell (2000). Vitamins in Animal and Human Nutrition (2 ed. ed.). Wiley-Blackwell. ISBN 0-8138-2630-6.
{{cite book}}:|edition=has extra text (help) - ^ Lydia Fehily (1944). "Human-milk intoxication due to B1 avitaminosis" (PDF). British Medical Journal. 2 (4374): 509-. PMC 2286425. PMID 20785731.