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Consumption of these drinks has more than doubled since the 1970s, and the rate of obesity among Americans during the same period reached 30% of the adult population, said the authors of a study published online by the New England Journal of Medicine.
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The first study, which involved more than 33,000 American men and women, showed that drinking sugary drinks was affecting genes that regulate weight and increased the genetic predisposition of a person to gain weight.
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The researchers used 32 variations of genes known to affect the weight to establish a genetic profile of the participants. They also determined the participants' eating habits, their consumption of sweetened beverages and exercise practices.
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The other two studies showed that giving to children and adolescents calorie-free drinks like mineral water or soft drinks sweetened with artificial sweeteners resulted in weight loss.
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The first was conducted at Children's Hospital Boston, which examined 224 overweight adolescents who were encouraged to consume water or light sodas for a year.
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These teens gained only 0.68 kilograms of weight during this period compared to 1.5 kilograms in another group that consumed sugary drinks.
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Yet another study was conducted by researchers at the VU University Amsterdam (the Netherlands) and involved 641 children aged 4 to 11.
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Half of the group drank sweet and fruity drinks while the other half the same drinks with sugarless sweeteners.
After 18 months, children who consumed the low-calorie drinks gained 6.39 kilograms on average compared to 7.36 kilograms in the group that drank sugary fruit drinks.
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"Taken together, these three studies suggest that calories from sugar-sweetened beverages do matter," said Doctor Sonia Caprio of Yale University writing in the New England Journal of Medicine.
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"These randomized, controlled studies ... provide a strong impetus to develop recommendations and policy decisions to limit consumption of sugar-sweetened beverages, especially those served at low cost and in excessive portions, to attempt to reverse the increase in childhood obesity," she added.
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Source: http://www.mnn.com/food/beverages/stories/studies-link-obesity-to-sweet-drinks
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