In study findings that may not surprise many people, kids and teens ate more calories - including more fat and more sugar - on days when they had a meal from a fast-food or sit-down restaurant.
"Parents [should] realise that restaurant consumption is not a straight-off substitute for eating at home. Restaurant consumption and fast-food consumption should not be the norm," said lead researcher Lisa Powell from the University of Illinois at Chicago.
"The additional calories and the additional sugar and saturated fat and sodium that are taken in and then consistently taken in will have some longer-term consequences," she told Reuters Health - such as an increased risk of obesity and diabetes.
For their new study, Powell and her co-author Binh Nguyen used data from nationally-representative health surveys conducted in the United States between 2003 and 2008.
On two different occasions, more than 9,000 teens were asked to recall everything they'd had to eat or drink in the past 24 hours. Parents were asked the same question for their younger children.
Between 24 and 42 percent of kids and teens had gotten take-out or eaten at a fast-food restaurant during each day they were questioned, and seven to 18 per cent had eaten at a full-service restaurant.
Based on the researchers' calculations, adolescents ate and drank an extra 310 calories on days they had fast food and an extra 267 on days they ate at a full-service restaurant. Younger kids age two to 11 had an extra 126 and 160 calories on those days, on average.
Kids from poorer families got the most extra calories on days when they went to a fast-food or sit-down restaurant.
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