目前，无论在发达国家还是发展中国家，肥胖症发病率都呈上升的趋势．世界卫生组织的报告指出，全球约有２．５亿的成年人患有肥胖症，另外至少５亿人属于超重［１］；美国有超过１０％的儿童患有肥胖症，１５％的儿童超重［２］．据保守估计，发达国家每年用于治疗肥胖的费用 At present, the incidence of obesity is on the rise in both developed and developing countries. The World Health Organization reports that about 250 million adults worldwide are obese and at least 500 million are overweight.1 More than 10% of children in the United States have obesity and 15% are overweight [2]. According to a conservative estimate, the cost of obesity treatment in developed countries is used annually