Vitamin A Deficiency: Causes, Symptoms & Treatment
Vitamin A deficiency is a widespread nutritional disorder causing night blindness, weakened immunity, and skin problems. Children and pregnant women are at greatest risk.
Things worth knowing about "Vitamin A deficiency"
Vitamin A deficiency is a widespread nutritional disorder causing night blindness, weakened immunity, and skin problems. Children and pregnant women are at greatest risk.
What Is Vitamin A Deficiency?
Vitamin A deficiency (also called hypovitaminosis A) occurs when the body does not receive or store enough vitamin A to maintain essential functions. Vitamin A is a fat-soluble vitamin critical for vision, immune defense, cell growth, and skin health. Globally, it is one of the leading causes of preventable blindness in children and a major public health concern in low-income countries.
Causes
Vitamin A deficiency can result from several factors:
- Insufficient dietary intake: Diets low in animal products (liver, dairy, eggs) and vitamin A-rich vegetables such as carrots, sweet potatoes, and spinach.
- Malabsorption: Conditions like Crohn's disease, celiac disease, or chronic pancreatitis impair fat absorption and therefore the uptake of fat-soluble vitamins.
- Increased demand: Pregnancy, breastfeeding, and periods of rapid growth in children raise vitamin A requirements.
- Liver disease: Since vitamin A is primarily stored in the liver, impaired liver function can reduce storage and release.
- Poverty and malnutrition: Vitamin A deficiency is especially prevalent in developing regions and remains a serious public health problem.
Symptoms
Symptoms often develop gradually and can affect multiple organ systems:
- Night blindness (nyctalopia): Often the earliest sign of deficiency – difficulty seeing in low light or darkness.
- Xerophthalmia: Dryness of the conjunctiva and cornea, which can progress to irreversible blindness if untreated.
- Bitot's spots: Whitish, foamy deposits on the conjunctiva of the eye, a classic clinical sign.
- Dry, scaly skin (xerosis): The skin becomes rough and prone to excessive keratinization.
- Increased susceptibility to infections: A weakened immune system leads to more frequent and more severe infections.
- Growth retardation: In children, deficiency can impair physical development.
- Damage to mucous membranes: Reduced protective function of mucous membranes in the respiratory and digestive tracts.
Risk Groups
Certain populations are at heightened risk of developing vitamin A deficiency:
- Infants and young children in developing countries
- Pregnant and breastfeeding women
- People with chronic intestinal diseases or malabsorption syndromes
- Individuals with alcohol dependency
- People following very restricted or very low-fat diets
Diagnosis
Vitamin A deficiency is diagnosed through:
- Blood test: Measurement of serum retinol levels. Values below 0.70 µmol/l indicate deficiency.
- Ophthalmic examination: Detection of night blindness, xerophthalmia, or Bitot's spots.
- Clinical history: Assessment of dietary habits, underlying conditions, and characteristic symptoms.
Treatment
Treatment depends on the severity of the deficiency:
- Dietary adjustment: Increased intake of vitamin A-rich foods such as liver, carrots, sweet potatoes, spinach, mango, and dairy products.
- Supplementation: For clinically significant deficiency, high-dose vitamin A supplements (retinol) are administered. The WHO recommends single doses of 100,000 to 200,000 IU for children with severe deficiency.
- Treatment of underlying conditions: If malabsorption is the cause, the underlying disorder must be managed.
Important Note on Dosage
Vitamin A is a fat-soluble vitamin that accumulates in the body. Excessive intake can lead to vitamin A toxicity (hypervitaminosis A), which causes serious health problems. High-dose supplements should therefore only be taken under medical supervision. During pregnancy, special caution is required, as excessive vitamin A can be teratogenic (harmful to the developing fetus).
Recommended Daily Intake
The World Health Organization (WHO) recommends the following daily intakes of vitamin A (in µg retinol activity equivalents, RAE):
- Adult men: 900 µg RAE
- Adult women: 700 µg RAE
- Pregnant women: 770 µg RAE
- Breastfeeding women: 1,300 µg RAE
- Children (by age group): 300–600 µg RAE
References
- World Health Organization (WHO): Vitamin A deficiency. Geneva, 2023. Available at: https://www.who.int/health-topics/vitamin-a-deficiency
- Sommer A, Vyas KS: A global clinical view on vitamin A and carotenoids. American Journal of Clinical Nutrition, 2012;96(5):1204S–1206S. PubMed PMID: 23053557.
- Ross AC et al.: The 2011 Dietary Reference Intakes for Calcium and Vitamin D. National Academies Press, Washington DC, 2011.
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