disorders of nutrition
Vitamin A Deficiency
Causes of Vitamin A Deficiency
Vitamin A deficiency is common among people who have had a severe deficiency of protein and calories (protein-energy undernutrition Protein-Energy Undernutrition Undernutrition is a deficiency of calories or of one or more essential nutrients. Undernutrition may develop because people cannot obtain or prepare food, have a disorder that makes eating or... read more ) for a long time. People with this disorder do not consume enough vitamin A, and storage and use of vitamin A is impaired.