Children of America are getting fatter every time. 13% of the children at the age of 6 to 11 are overweight(too fat). When we look at children's lives today in the USA, we can see the root(origin)of the problem--sports and foods. Young children like sports but they don't have enough around the start of high school. That's especially true for girls. Meanwhile, to make matters worse, schools are becoming much more interested in sports teams. So children are not able to get enough exercise just when they need it the most. There is also the food problem. Children get most of their calories  at restaurants or parties or somewhere else away from home. They often drink too many Cokes. Parents have a lot of fears about telling a child he needs to lose weight-- they are afraid it will push a child into an eating disorder. Some parents fear that pushing children to lose weight means their children will think they're not good enough, or not loved because of their weight. Parents need to come to terms with the fact that the family is very important to the children. The most useful program for children is called "family weight control". This is good news. Mom and Dad, even if they don't have weight problems, have to go through the same program as their children and learn how to get some exercise and how to eat healthily. Which of the following is NOT the root of overweight problem?   _  .
Higher-calorie. Less sports. Family weight control. higher-fat foods.