Vitamin A Overview:
- Fat-soluble nutrient vital for vision, immune system, cell growth, and reproduction.
Forms:
- Preformed (animal sources) and provitamin A carotenoids (plant sources).
Function:
- Essential for vision, immune health, cell growth, and reproduction.
Sources:
- Animal: Liver, fish, dairy; Plant: Carrots, spinach, sweet potatoes.
Deficiency:
- Night blindness, immune dysfunction, xerophthalmia.
Toxicity:
- Hypervitaminosis A with symptoms like nausea, liver damage.
Recommendations:
- Vary by age and gender; avoid excess during pregnancy.
