在近 2 0年中 ,美国青少年肥胖率超出以往近 3倍 ,其中 1 5%年龄在 1 2～ 1 7岁。最近 ,美国儿科协会对 6 2 1 2名 4～ 1 9岁在校学生每日的饮食情况作了调查 ,发现其中 30 %的学生食用快餐食品 ,这些快餐食品口感好 ,却含有过量的糖、饱和脂肪酸和不饱和脂肪酸 ,而纤维膳食含 In the recent 20 years, the rate of obesity in the U.S. adolescents has nearly tripled, with 15% of those aged 12 to 17 years old. Recently, the American Academy of Pediatrics conducted a survey on the daily dietary conditions of 6212 school-aged children aged 4 to 19 and found that 30% of the students consumed fast food which was good in taste but contained excessive amounts of sugar, Saturated fatty acids and unsaturated fatty acids, while the fiber diet