Vitamin Deficiency, Dependency, And Toxicity

The document discusses the importance of vitamins in small dietary amounts for energy metabolism, tissue growth, development, and maintenance. It highlights that vitamin A deficiency is a leading cause of non-accidental blindness globally, while vitamin D deficiency can lead to rickets or osteomalacia. Vitamin E deficiency, though rare, is associated with cystic fibrosis or Crohn’s disease and can cause hemolytic anemia. Vitamin K deficiency can result in defective blood clotting. Water-soluble vitamins, stored in small amounts, include vitamin B1, whose deficiency can cause beriberi and Wernicke encephalopathy in alcoholics. Vitamin B2 deficiency leads to ariboflavinosis, B3 deficiency to pellagra, and B6 deficiency to anemia and neurological issues. Vitamin B7 deficiency, though rare, can cause hair loss and other symptoms. Vitamin B9 deficiency is critical during pregnancy due to the risk of neural tube defects. Vitamin B12 deficiency can cause anemia and severe nerve degeneration. Lastly, vitamin C deficiency results in scurvy and potential psychological problems.