Classify Vitamins. Discuss deficiency symptoms of fat-soluble vitamins. (IFS 2021, 10 Marks)

Introduction

Vitamins are essential organic compounds required in small amounts for various physiological functions in the body. They are classified into two categories: fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins include vitamins A, D, E, and K.

Classification of Vitamins

• Fat-Soluble Vitamins:
  
  • These vitamins are soluble in lipids (fats) and are usually stored in the liver and adipose (fat) tissues.
  • They require bile for absorption and can be stored in the body for long periods.
  • The main fat-soluble vitamins are:
    
    • Vitamin A (Retinol)
    • Vitamin D (Calciferol)
    • Vitamin E (Tocopherol)
    • Vitamin K (Phylloquinone)
• Water-Soluble Vitamins:
  
  • These vitamins are soluble in water and are not stored in the body. Excess amounts are usually excreted through urine.
  • They are absorbed directly into the bloodstream and are necessary for various metabolic activities.
  • The main water-soluble vitamins are:
    
    • Vitamin C (Ascorbic acid)
    • Vitamin B complex:
  • Vitamin B1 (Thiamine)
  • Vitamin B2 (Riboflavin)
  • Vitamin B3 (Niacin)
  • Vitamin B5 (Pantothenic acid)
  • Vitamin B6 (Pyridoxine)
  • Vitamin B7 (Biotin)
  • Vitamin B9 (Folic acid)
  • Vitamin B12 (Cobalamin)

Deficiency Symptoms of Fat-Soluble Vitamins

• Vitamin A (Retinol):
  
  • Deficiency Symptoms:
    
    • Night blindness (impaired vision in low light)
    • Xerophthalmia (dryness and thickening of the cornea)
    • Increased susceptibility to infections (due to weakened immunity)
    • Stunted growth (in children)
    • Keratinization of skin (rough, scaly skin)
• Vitamin D (Calciferol):
  
  • Deficiency Symptoms:
    
    • Rickets (in children) – Softening of bones leading to deformities like bowed legs.
    • Osteomalacia (in adults) – Softening of bones, leading to pain and fractures.
    • Muscle weakness and fatigue.
    • Impaired calcium absorption, leading to low blood calcium levels.
• Vitamin E (Tocopherol):
  
  • Deficiency Symptoms:
    
    • Neurological issues such as muscle weakness, atrophy, and vision problems.
    • Hemolysis of red blood cells, leading to anemia.
    • Immune dysfunction, resulting in increased risk of infections.
    • Problems with coordination (ataxia).
• Vitamin K (Phylloquinone):
  
  • Deficiency Symptoms:
    
    • Excessive bleeding (due to impaired blood clotting).
    • Hemorrhagic disease (in newborns).
    • Bone weakness (increased risk of fractures).
    • Bruising and easy bleeding from minor cuts or wounds.

Conclusion

Fat-soluble vitamins play crucial roles in various physiological functions in the body, and their deficiency can lead to serious health issues. It is important to maintain a balanced diet rich in these vitamins to prevent deficiency symptoms and ensure overall well-being.