听力原文： While many overweight people claim to have a strong desire to shed excess pounds, most do little to achieve this goal, a new study suggests. Researchers at the Mayo Clinic in Rochester, Minnesota report that only one in three people who are trying to lose weight, and one in five people trying not to gain weight, follow the widely recommended approach of at least 150 minutes of exercise weekly and reduced caloric intake. A staggering 61% of American adults currently meet the scientific definition of overweight or obesity, putting them at increased risk of heart disease, diabetes, stroke, arthritis, depression and several forms of cancer. According to the study, how many people really intend to lose weight?