In the past 20 years, the obesity rate of American teenagers has nearly tripled, of which 15% are aged 12 ~ 17. Recently, the American Pediatric Association has made a survey on the daily diet of 6,212 students aged 4 ~ 19, and found that 30% of them eat fast food, which tastes good, but contains excessive sugar, saturated fatty acids and unsaturated fatty acids, but little fiber diet.
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