A、Because they want to keep fit. B、Because they want to look pleasant. C、Because they are misled by doctors. D、Both A and B. D

About 70 million Americans are trying to lose weight. That is almost 1 out of every 3 people in the United States. Some people are on a diet. This means they eat less of certain foods, especially fats and sugars other people exercise with special equipment, take medicine, or even have operation. Losing weight is hard work, and it can also cost a lot of money. But why do so many people in the United States want to lose weight?
    Many people in the United States worry about not looking young and pleasant. For many people, looking good means being thin. Other people worry about their health. Many doctors say being overweight is not healthy. But are Americans really fat?Almost 30 million people in America weigh at least 20 percent more than their proper weight. In fact, the United States is the most overweight country in the world.