Even though there is such a large food production in India and it is one of the largest exporters of food products in the world, many people still suffer from hunger. India's economy has boomed in recent decades, creating an even wider gap between rich and poor. Although the middle and upper classes outnumber the poor, the population is so large that the number of people living below the poverty line is unprecedented. Malnutrition among the poor is India's biggest food security and nutrition problem. Undernutrition is more common in rural India, but it occurs even in cities. According to Unicef, of the 20% of children worldwide who are “emaciated” (a person or part of the body becoming progressively weaker and emaciated), more than a third are Indian citizens. For children under five years old alone, 43% are underweight and 48% (or 61 million children) are stunted due to malnutrition. Lack of education is a major contributor to the wide disparity in nutritional security. Children whose mothers have less than 12 years of school education are five times more likely to be in school.