Vitamin B6 (Pyridoxine)

Sources of Vitamin B6

Meat

Chicken, turkey, and beef.

Fish

Tuna, salmon, and sardines.

Vegetables

Spinach, carrots, peas.

Fruits

Bananas, avocados, watermelon.

Whole Grains and Nuts

Brown rice, sunflower seeds, and walnuts.

Functions of Vitamin B6

Protein Metabolism: Aids in the breakdown and utilization of proteins in the body.

Neurotransmitter Synthesis: Crucial for creating neurotransmitters like serotonin.

Haemoglobin Production: Involved in the formation of haemoglobin in red blood cells.

Immune Function: Supports the health of the immune system.

Effects of Pyridoxine Deficiency

Anaemia: Due to its role in haemoglobin production.

Skin Disorders: Like dermatitis and skin rashes.

Neurological Symptoms: Nerve damage leading to tingling and numbness.

Mood Changes: Depression and confusion can result from a deficiency.

Recommended Dietary Allowances (RDAs) for Pyridoxine

Adult Men

1.3 - 1.7 mg/day

Adult Women

1.2 – 1.5 mg/day.

During Pregnancy or Lactation

1.9 – 2.0 mg/day.

Properties of Vitamin B6

Stability

Relatively stable to heat but can be lost during prolonged cooking.

Solubility

Water-soluble, not stored extensively in the body, necessitating regular intake.

Interaction with Medications

Certain drugs can reduce pyridoxine levels in the body.

Example Exam Questions and Answers

1. Outline the primary functions of vitamin B6 in the human body.

Vitamin B6 is vital for protein metabolism, neurotransmitter synthesis, haemoglobin production, and maintaining immune system health.

2. What are common dietary sources of vitamin B6?

Sources include meat (like chicken and beef), fish (such as tuna and salmon), vegetables (e.g., spinach and carrots), fruits (like bananas and avocados), and whole grains.

3. Describe the effects of a vitamin B6 deficiency.

Deficiency can lead to anaemia, skin disorders, neurological symptoms, and mood changes.