A life spent chronically or cyclically malnurished is a life of limit opportunity, sickness, and often premature death. Hunger represents a basic denial of the opportunity for people to develope to their potentials. It is a fundamental injustice. Even in a free country, a person who is hungry is not free. The largest number of hungry people live in South Asia.
Children have the highest poverty rate of any age group.
US has the highest child poverty rate of any developed country. Progress has been made, but far to many still suffer needlessly. In short, the cause is Poverty . Enough food is grown worldwide, the problem is that many people can't produce or buy all they need. They must have land or an income.