Vitamin B Complex and Its Deficiency Diseases – Important Facts and MCQs
Main Explanation
Vitamin B complex includes a group of vitamins that mainly help the body convert food into energy. They are called water-soluble vitamins because they dissolve in water and excess amounts are usually removed through urine. Therefore, except vitamin B12, most B vitamins are not stored in large quantities in the body. Regular intake through a balanced diet is important for normal growth, brain function, nerve health, skin maintenance and blood formation.
The major vitamins in the B complex group are Vitamin B1 or Thiamine, Vitamin B2 or Riboflavin, Vitamin B3 or Niacin, Vitamin B5 or Pantothenic acid, Vitamin B6 or Pyridoxine, Vitamin B7 or Biotin, Vitamin B9 or Folate and Vitamin B12 or Cobalamin. Each vitamin has a specific function. Thiamine is important for carbohydrate metabolism and nerve function. Riboflavin helps in energy release and supports skin and mucous membranes. Niacin is important for energy metabolism, skin health and nervous system function. Pantothenic acid is required for coenzyme A formation, which is useful in many metabolic reactions.
Vitamin B6 is involved in amino acid metabolism, neurotransmitter synthesis and hemoglobin formation. Biotin helps in fat, carbohydrate and protein metabolism. Folate is essential for DNA synthesis and red blood cell formation. Vitamin B12 is necessary for nerve function, DNA synthesis and the formation of healthy red blood cells. Folate and B12 are especially important because their deficiency can cause megaloblastic anemia. Folate deficiency during pregnancy is also associated with neural tube defects in the developing baby.
Deficiency diseases of B vitamins are frequently asked in exams. Vitamin B1 deficiency causes beriberi and may also be linked with Wernicke-Korsakoff syndrome in severe cases. Vitamin B2 deficiency causes ariboflavinosis, which may show symptoms such as cracks at mouth corners, sore tongue and skin problems. Vitamin B3 deficiency causes pellagra, commonly remembered by the “3 Ds”: dermatitis, diarrhea and dementia. Vitamin B9 deficiency causes megaloblastic anemia, and Vitamin B12 deficiency can cause megaloblastic anemia along with neurological symptoms. Hence, vitamin B complex is an important and scoring topic for competitive exams.
Important Facts
| Vitamin | Chemical Name | Major Function | Deficiency Disease / Symptoms |
|---|---|---|---|
| B1 | Thiamine | Carbohydrate metabolism and nerve function | Beriberi; Wernicke-Korsakoff syndrome in severe deficiency |
| B2 | Riboflavin | Energy release, skin and mucous membrane health | Ariboflavinosis, cheilosis, glossitis, mouth cracks |
| B3 | Niacin | Energy metabolism and nervous system function | Pellagra – dermatitis, diarrhea and dementia |
| B5 | Pantothenic Acid | Formation of coenzyme A and metabolism | Rare; fatigue, irritability, numbness or burning feet may occur |
| B6 | Pyridoxine | Amino acid metabolism and hemoglobin formation | Anemia, dermatitis, confusion, weak immunity |
| B7 | Biotin | Fat, carbohydrate and protein metabolism | Hair thinning, skin rash, dermatitis, neurological symptoms |
| B9 | Folate / Folic Acid | DNA synthesis and red blood cell formation | Megaloblastic anemia; neural tube defects during pregnancy |
| B12 | Cobalamin | Nerve function, DNA synthesis and RBC formation | Megaloblastic anemia, neuropathy, memory and balance problems |
10 MCQs on Vitamin B Complex and Deficiency Diseases
1. Which vitamin is also known as Thiamine?
Answer: A) Vitamin B1
Explanation: Vitamin B1 is called Thiamine. It is important for energy metabolism and nerve function. Its deficiency causes beriberi.
2. Beriberi is caused by deficiency of which vitamin?
Answer: A) Vitamin B1
Explanation: Beriberi is the classical deficiency disease of Vitamin B1 or Thiamine. It mainly affects the nervous system and cardiovascular system.
3. Pellagra is caused by deficiency of which vitamin?
Answer: B) Niacin
Explanation: Pellagra is caused by deficiency of Vitamin B3 or Niacin. It is remembered by the symptoms dermatitis, diarrhea and dementia.
4. Which of the following is commonly called Vitamin B12?
Answer: C) Cobalamin
Explanation: Vitamin B12 is called Cobalamin. It is important for nerve function, DNA synthesis and formation of healthy red blood cells.
5. Deficiency of folate mainly causes which type of anemia?
Answer: B) Megaloblastic anemia
Explanation: Folate or Vitamin B9 deficiency affects DNA synthesis and red blood cell formation, leading to megaloblastic anemia.
6. Which vitamin deficiency is associated with neural tube defects during pregnancy?
Answer: D) Vitamin B9
Explanation: Vitamin B9, also called Folate or Folic acid, is important during pregnancy. Deficiency is associated with neural tube defects in the developing baby.
7. Riboflavin is the chemical name of which vitamin?
Answer: B) Vitamin B2
Explanation: Vitamin B2 is called Riboflavin. Its deficiency may cause ariboflavinosis, mouth cracks, sore tongue and skin-related symptoms.
8. Which vitamin is also known as Biotin?
Answer: C) Vitamin B7
Explanation: Vitamin B7 is called Biotin. It helps in the metabolism of fats, carbohydrates and proteins. Deficiency may cause hair thinning and skin rash.
9. The “3 Ds” of pellagra are related to which vitamin deficiency?
Answer: C) Vitamin B3
Explanation: Pellagra occurs due to deficiency of Vitamin B3 or Niacin. The 3 Ds are dermatitis, diarrhea and dementia.
10. Which vitamin B deficiency may cause neurological symptoms along with megaloblastic anemia?
Answer: D) Vitamin B12
Explanation: Vitamin B12 deficiency can cause megaloblastic anemia and neurological symptoms such as numbness, balance problems and memory-related issues.
FAQs on Vitamin B Complex
1. What is Vitamin B complex?
Vitamin B complex is a group of water-soluble vitamins that help in energy production, metabolism, nerve function, skin health and red blood cell formation.
2. Which vitamin deficiency causes beriberi?
Beriberi is caused by deficiency of Vitamin B1, also called Thiamine.
3. Which vitamin deficiency causes pellagra?
Pellagra is caused by deficiency of Vitamin B3, also called Niacin. It is associated with dermatitis, diarrhea and dementia.
4. Why is folic acid important during pregnancy?
Folic acid or Vitamin B9 is important for DNA synthesis and proper development of the nervous system. Its deficiency during pregnancy is associated with neural tube defects.
5. Which Vitamin B deficiency affects nerves?
Vitamin B12 deficiency is important because it can affect nerve function and may cause numbness, balance problems and memory-related symptoms.
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