Vitamin A deficiency 250 million pre-school children are Vitamin A deficient, and the condition is the leading cause of preventable childhood blindness worldwide, especially in low-income countries. Vitamin A is essential for growth and development, eye health and a strong immune system. The World Health Organization aims to eliminate Vitamin A deficiency, and food fortification is a key part of the strategy. What is Nestlé doing to help? Click on our infographic.