There's a saying that goes, "You are what you eat. "It means important to eat good food in order to stay healthy and fit. Kids in Japan  a good example of this.

    A recent report by UNICEF shows that Japan tops the world in the quality of its children's health.

    Experts say are many reasons for this. A nationwide school lunch program has played a key role.

    In Japan, school lunch is mandatory (强制性的). Schools don't allow students to bring packed lunches. Children usually eat lunches in their classrooms. They give  food to each other and clean up the room afterwards.

    Mitsuhiko Hara, a professor at Tokyo Kasei Gakuin University, saidnutritionists (营养师) made the menus for the school lunches and all primary schools and a large number of junior high schools throughout Japan used these menus.