The randomized, controlled trial, led by Cara Ebbeling, PhD, and David Ludwig, MD, PhD, in the hospital's Division of Endocrinology, enrolled 103 children aged 13 to 18 through a Boston area high school. The teens were offered a $100 mall gift certificate if they stuck with the six-month study, and all did.
Half the teens, picked at random, received weekly deliveries of noncaloric beverages of their own choosing bottled waters and artificially-sweetened drinks. They were instructed to avoid sugar-sweetened beverages and advised on how to choose noncaloric drinks outside the home. Monthly phone calls and refrigerator magnets ("Think Before You Drink") provided reminders. The remaining teens, serving as a control group, were asked to continue their usual eating and drinking patterns.
At the end of six months, the group receiving beverage deliveries had an 82 percent reduction in consumption of sugary drinks, while intake in the control group remained unchanged. The heavier the teen was initially, the stronger the effect on body weight. Among the heaviest one-third of teens, the beverage-delivery group had a marked decrease in body mass index (BMI), while the control group had a slight increase a group-to-group difference of almost 1 pound per month. Other factors affecting obesity physical activity levels and television viewing did not change in either group.
Ebbeling calculates that a single 12-oz sugar-sweetened beverage per day translates to about 1 pound of weight gain over 3 to 4 weeks.
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Contact: Andrea Duggan
andrea.duggan@childrens.harvard.edu
617-355-6420
Children's Hospital Boston
6-Mar-2006