Teenagers who eat a high-sodium diet tend to be heavier and have more body fat than those who eat less salt, according to a new study.
Researchers found that was the case regardless of how much total food teenagers ate or how often they drank sugary beverages.
Dietary sodium has been linked to obesity in previous studies. But most scientists believe it's only an indirect association, because people who consume a lot of sodium tend to eat more food in general.
"Our study and studies looking into national data all show that average dietary sodium consumed is 3,300-3,400 milligrams daily in children, as high as that of adults," said the lead researcher from Georgia Regents University in Augusta.
The American Heart Association recommends that everyone keep sodium intake to less than 1,500 mg per day, but 90 percent of children exceed that amount.
For the study, the researchers measured the body composition of 766 healthy 14- to 18-year-olds.
They also collected diet information from the participants by asking them to remember everything they had eaten in the past 24 hours up to seven different times over a few months. On average, the teens consumed about 3,280 mg of sodium every day.
Kids who ate more sodium tended to be heavier. Those in the top third of sodium intake weighed approximately four pounds more than those in the bottom third, on average - about 149 pounds versus 145 pounds.
Teens with a high-sodium diet also generally had a higher percentage of body fat and showed more signs of body-wide inflammation.
Those associations held up when the researchers took into account teens' physical activity levels as well as how much food they ate and how many sugar-sweetened beverages they drank, according to the findings published in Pediatrics.
Animal studies suggest that diets high in salt promote fat cells to grow bigger. High-salt diets might also stimulate the brain's reward and pleasure center, which increases the chance of overeating and obesity.
This study suggests that limiting sodium intake will help reduce obesity - we already know that limiting sodium intake helps reduce high blood pressure, said researchers.
Taste preferences for salt appear to be formed early in life. Therefore, parents should worry about their kids' sodium intake since healthy dietary habits learned in childhood are carried forward to adulthood.
Parents should read nutrition labels at the supermarket to shop wisely for the foods they feed their children, experts advise. Parents should also emphasize eating at home rather than eating at restaurants or fast food chains. Using spices rather than salt may help reduce the amount sodium their children eat.
Source: Pediatrics, online February 3, 2014.
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