Okay kiddo, so the Global Food Security Act of 2009 is like a set of rules that the government made to help make sure that people all around the world have enough food to eat.
Sometimes, people in different countries don't have enough money or resources to grow or buy food, and this can be very scary and dangerous. So, this act was made to help get more money and resources to people who need it, so that they can have enough food to eat and live healthy lives.
It's like when you share your toys with your friends. The government is sharing resources with people all around the world so that everyone can have enough food to eat and be healthy.